# Strategy Specifications
## Deck Name And Archetype

Doomsday is a Legacy combo deck with a compact blue-black spell core, disruptive free interaction, and a transformational creature-pressure package. The registered list is 60 main-deck cards and 15 sideboard cards, and the active validation contract says it passes Legacy deck-count and sideboard-size requirements. Runtime decisions must still obey the rules engine's exact legal actions, because this guide does not certify card text, target legality, timing windows, replacement effects, or hidden-zone contents.

- Format: Legacy.
- Strategy name: Doomsday.
- Current tags: combo; spells.
- Main deck count: 60.
- Sideboard count: 15.
- Validation status: active format-aware validation passes.
- Stock status: hybrid Doomsday shell, not a pure stock list, because it combines Doomsday; Thassa's Oracle; Jace, Wielder of Mysteries; Dark Ritual; Lion's Eye Diamond; Lotus Petal; Brainstorm; Ponder; Consider; Edge of Autumn; Street Wraith; Force of Will; Daze; Thoughtseize with a proactive pressure package of Tamiyo, Inquisitive Student; Murktide Regent; Wasteland; and sideboard Barrowgoyf.
- Opponent info status: no specific opponent deck, matchup, game state, known hand, clock, or sideboard plan is supplied in this batch, so all opponent-facing rules must be treated as archetype-conditional until visible public information or logged matchup metadata exists.

The deck's primary identity is still a Doomsday deck, so the pilot should value hands and lines that assemble a protected win before fair combat becomes the only plan. The main registered combo cards are Doomsday; Thassa's Oracle; Jace, Wielder of Mysteries; Lion's Eye Diamond; Lotus Petal; Dark Ritual; Brainstorm; Ponder; Consider; Edge of Autumn; Street Wraith; and Flow State, with Force of Will; Daze; and Thoughtseize giving protection or disruption. Card text check required for Flow State before assigning it deterministic pile, draw, selection, or protection duties.

The deck's secondary identity is a blue-black tempo-control deck when combo commitment is unsafe or unavailable. Tamiyo, Inquisitive Student; Murktide Regent; Wasteland; Thoughtseize; Force of Will; Daze; Brainstorm; Ponder; Consider; and Flow State can support a slower plan that pressures life totals, taxes mana, and buys time for a later protected Doomsday. The decision agent should not assume that creature pressure is the default plan; it becomes attractive when visible resources show that immediate combo is exposed, unavailable, or unnecessary.

Mana and role concerns are central because the list is compressed and color-demanding. The registered lands are Polluted Delta; Scalding Tarn; Misty Rainforest; Marsh Flats; Flooded Strand; Underground Sea; Undercity Sewers; Snow-Covered Island; Snow-Covered Swamp; Cavern of Souls; and Wasteland, with Lotus Petal; Lion's Eye Diamond; and Dark Ritual as burst mana. The agent must protect access to black for Doomsday and Dark Ritual, blue for cantrips and Thassa's Oracle, and enough total mana to execute the chosen legal line after disruption, while treating Wasteland and Cavern of Souls as powerful but role-sensitive lands rather than automatic early plays.

Legality concerns are mostly tactical rather than deck-construction based. The list passes the supplied validation contract, but the pilot must not infer that any visible card can be cast, activated, pitched, exiled, sacrificed, cycled, or used as mana unless Veles exposes that exact legal action. The guide may recommend preserving Force of Will, Daze, Thoughtseize, Lotus Petal, Lion's Eye Diamond, Edge of Autumn, Street Wraith, or fetch lands for combo timing, but runtime action choice must follow the legal action list exactly.

Sideboard identity is flexible and matchup-sensitive. Barrowgoyf and Dauthi Voidwalker can increase threat density or graveyard pressure, Fatal Push; Long Goodbye; and Bitter Triumph can answer creatures or problematic permanents when legal, and Consign to Memory plus Force of Negation can expand stack interaction in matchups where protecting the combo or stopping opposing engines matters more than speed. Exact sideboard plans belong only in the Sideboard Map section; this opening section only establishes that sideboarding may shift the deck between fast combo, protected combo, tempo pressure, and interaction-heavy roles.

## Thesis

Doomsday assembles a protected library-collapse win using Doomsday plus a compact draw/payoff package, then converts the forced tiny-library state into victory through Thassa's Oracle or Jace, Wielder of Mysteries. The pilot's first priority is not maximum card quantity; it is reaching a legal commitment window where black mana, blue follow-up, a draw or cast path, and enough disruption are all accounted for from visible resources and known public information.

The deck wins by sequencing discard, free interaction, burst mana, and cantrips so the Doomsday turn is either lethal immediately or insulated from the most likely visible answer. Dark Ritual, Lotus Petal, Lion's Eye Diamond, Underground Sea, and fetch lands are the main accelerants toward Doomsday, while Brainstorm, Ponder, Consider, Edge of Autumn, Street Wraith, and possibly Flow State help find pieces or execute after the pile is made. Card text check required for Flow State before assigning it deterministic pile, draw, selection, or protection duties.

The deck is not trying to play a long fair control game unless combo access is blocked or sideboarding has shifted the role. Tamiyo, Inquisitive Student, Murktide Regent, Wasteland, Thoughtseize, Force of Will, Daze, and post-board Barrowgoyf can win games by pressure and disruption, but those lines should serve the combo plan unless the visible board, life totals, or opposing resources make fair pressure safer than committing to Doomsday.

Prioritize protected inevitability over flashy speed when the opponent has open mana, known interaction, lethal pressure that changes the clock, or public hate pieces. Prioritize speed when the opponent is presenting a faster combo clock, when Thoughtseize reveals a narrow window, when Force of Will or Daze can cover the relevant answer, or when waiting risks losing mana, life, or hand texture.

## Role Package

- Threats: Tamiyo, Inquisitive Student and Murktide Regent are the main-deck fair threats, and they matter most when the opponent must answer pressure before holding interaction for Doomsday. Use them to force action, punish opponents who over-sideboard for combo, and create a backup win if the payoff cards are disrupted.

- Payoffs: Thassa's Oracle and Jace, Wielder of Mysteries are the primary deterministic win payoffs after Doomsday has made the library small enough for their legal text to matter. Do not cast either as a casual value spell unless Veles shows a legal action and the game state makes the non-combo use clearly necessary.

- Engines: Doomsday is the defining engine, and every setup decision should ask whether the hand can produce a legal pile, survive the life loss and tempo cost, and execute before the opponent's visible clock or known disruption catches up. Tamiyo, Inquisitive Student can function as a pressure-and-card-advantage engine only when its legal actions and transformed status are exposed by the rules engine.

- Velocity: Brainstorm, Ponder, Consider, Street Wraith, Edge of Autumn, and Flow State are the card-flow module that finds combo pieces, sculpts protection, and enables post-Doomsday movement through the remaining library. Card text check required for Flow State, so treat it as conditional velocity until the runtime card text or legal action labels prove its exact function.

- Interaction: Thoughtseize, Force of Will, Daze, Wasteland, and sideboard Consign to Memory, Force of Negation, Fatal Push, Long Goodbye, Bitter Triumph, and Dauthi Voidwalker are the tools for buying a safe window. Choose interaction based on the actual threat class shown: stack fight, creature pressure, graveyard dependency, permanent hate, or mana bottleneck.

- Protection: Force of Will, Daze, Thoughtseize, Cavern of Souls, Lotus Petal, and careful fetch sequencing protect the combo in different ways. Force of Will and Daze protect on the stack, Thoughtseize clears known answers before committing, Cavern of Souls can matter for creature payoff casting only when legal text and naming decisions support it, and Lotus Petal preserves surprise mana through a compact turn.

- Recursion: The registered main deck has no dedicated recursion module, so do not plan to recover spent Doomsday, Thassa's Oracle, Jace, Wielder of Mysteries, Lion's Eye Diamond, or key cantrips from the graveyard unless the rules engine exposes a specific legal action. Treat graveyard use mostly as Murktide Regent fuel, Dauthi Voidwalker pressure, or opponent-facing disruption after sideboard.

- Mana: Polluted Delta, Scalding Tarn, Misty Rainforest, Marsh Flats, Flooded Strand, Underground Sea, Undercity Sewers, Snow-Covered Island, Snow-Covered Swamp, Cavern of Souls, Wasteland, Lotus Petal, Lion's Eye Diamond, and Dark Ritual form a tight mana system with real tension between colored setup, burst combo mana, and mana denial. Preserve black access for Doomsday and Dark Ritual, blue access for cantrips and payoffs, and only prioritize Wasteland when mana denial improves the combo window or fair-threat race.

- Sideboard modules: Barrowgoyf expands the fair threat plan, Dauthi Voidwalker adds graveyard pressure and disruptive threat density, Consign to Memory and Force of Negation strengthen stack-based matchups, and Fatal Push, Long Goodbye, plus Bitter Triumph answer creature or permanent pressure when legal. Sideboarded games should decide whether to become faster combo, protected combo, threat-heavy tempo, or removal-backed survival before changing card emphasis.

## Primary Win Conditions

- Primary line: resolve Doomsday, then win with Thassa's Oracle after the library is small enough and the rules engine offers the legal payoff action. Set this up with black mana for Doomsday, blue mana for Thassa's Oracle or pile movement, and a draw/selection path from Brainstorm, Ponder, Consider, Street Wraith, Edge of Autumn, or Flow State; Card text check required for Flow State before treating it as a deterministic draw or selection piece. Prioritize this line when Thoughtseize has cleared a key answer, Force of Will or Daze can cover the stack, the opponent's visible clock makes waiting dangerous, or the hand already has Doomsday plus mana plus a follow-up draw/payoff route.

- Protected Oracle line: use Thoughtseize before Doomsday when the opponent has unknown interaction and the life total can absorb the tempo cost. Use Force of Will and Daze to protect Doomsday or Thassa's Oracle according to the visible stack, not by default; if the opponent's answer must stop the payoff, avoid spending protection on low-impact setup fights. Cavern of Souls may support creature-payoff protection only when the engine exposes a legal naming and mana line that actually applies to Thassa's Oracle.

- Jace line: win with Jace, Wielder of Mysteries when Thassa's Oracle is unavailable, discarded, exiled, or tactically unsafe, and the game state allows enough mana and time for the planeswalker route. This line needs more mana and usually more exposure to combat or permanent removal, so prioritize it when the opponent is light on battlefield pressure, when Force of Will or discard can defend the commitment, or when Doomsday piles can leave a reliable immediate draw action after Jace, Wielder of Mysteries resolves.

- Fast mana line: use Dark Ritual, Lotus Petal, and Lion's Eye Diamond to compress the Doomsday turn when the opponent is racing or tapped low. Treat Lion's Eye Diamond as a commitment tool, not generic acceleration; only use it when the visible legal action sequence preserves the necessary payoff, draw step, or graveyard/hand plan. Do not crack resources early just because they are available if waiting preserves protection or lets Thoughtseize define the window.

## Secondary Win Conditions

- Fair pressure line: win by attacking with Tamiyo, Inquisitive Student, Murktide Regent, or post-board Barrowgoyf when combo access is disrupted or the opponent overcommits to anti-combo resources. Use this plan to force the opponent to spend mana on their own turn, reduce their ability to hold interaction, and create a shorter clock that makes a later Doomsday easier to protect.

- Murktide Regent line: deploy Murktide Regent when the graveyard and mana make it a real clock and the combo path is currently blocked by missing Doomsday, missing payoff, known stack interaction, or dangerous life pressure. Do not exile resources blindly if Brainstorm, Ponder, Consider, Edge of Autumn, Street Wraith, Force of Will, or Daze still matter for assembling or protecting Doomsday.

- Tamiyo line: use Tamiyo, Inquisitive Student as early pressure, a blocker, and a potential value engine when the legal actions and board state support it. Card text and transformed-state details should come from the rules engine; do not assume a specific ability or timing if Veles has not exposed it.

- Mana-denial tempo line: use Wasteland to convert a fair threat or discard window into a win when the opponent is visibly constrained on mana. Avoid Wastelanding as a reflex if the deck needs colored mana for Brainstorm, Ponder, Doomsday, Thoughtseize, Thassa's Oracle, or Jace, Wielder of Mysteries on the next critical turn.

- Sideboard pressure line: use Dauthi Voidwalker and Barrowgoyf to win games where graveyard pressure, creature size, or redundant threats are better than relying on a single protected combo turn. Fatal Push, Long Goodbye, and Bitter Triumph support this plan by clearing blockers or must-answer creatures when legal.

## Emergency Lines

- Behind on life: prioritize the fastest protected Doomsday kill if the opponent's visible attacks or burn-like pressure leave too few turns for cantrip sculpting. Do not cast Doomsday just to be proactive if the life loss makes the opponent's existing board lethal before the payoff can resolve.

- Behind on board: use Fatal Push, Long Goodbye, Bitter Triumph, Force of Will, Daze, or Thoughtseize according to the actual legal threat axis, then decide whether the stabilizing turn creates a Doomsday window or requires a blocker such as Tamiyo, Inquisitive Student, Murktide Regent, Barrowgoyf, or Dauthi Voidwalker. If combat damage is already decisive, preserve blue interaction for the payoff only when the combo can win before the next attack.

- Behind on cards: value selection over raw speed unless the opponent is presenting lethal or a faster combo. Brainstorm and Ponder should repair hands, hide or find key cards, and set up fetch-land shuffles; Consider, Street Wraith, Edge of Autumn, and Flow State should advance the combo only when their legal text and timing are clear.

- Behind on mana: use Dark Ritual and Lotus Petal to recover tempo, but keep colored requirements explicit. Fetch for Underground Sea, Snow-Covered Island, Snow-Covered Swamp, or Undercity Sewers based on visible needs; Wasteland should usually wait unless denying the opponent buys more time than developing your own combo mana.

- Win conditions removed: shift immediately to the remaining payoff or fair-pressure plan. If Thassa's Oracle is gone, protect Jace, Wielder of Mysteries or attack with Murktide Regent and sideboard threats; if Jace, Wielder of Mysteries is gone, preserve Thassa's Oracle and avoid exposing it before the actual winning turn; if both combo payoffs are unavailable, treat Doomsday as unusable unless the rules engine exposes a legal winning line.

## Resource Model

- Life: spend life only when it advances a protected kill, repairs a failing hand, or prevents a worse clock. Thoughtseize, Force of Will, Street Wraith, fetch lands, and Doomsday all tax life, so count visible opposing attacks before choosing a fast pile, a cycling action, or a shock-free fetch sequence; after Doomsday, every exposed damage source becomes more important.

- Hand: treat hand size as both combo assembly and protection density. Brainstorm, Ponder, Consider, Flow State, Street Wraith, and Edge of Autumn are card-flow tools, but Card text check required for Flow State before relying on it as a draw, selection, or spell-count resource. Preserve at least one blue card for Force of Will when the opponent can interact on the stack, and do not let Lion's Eye Diamond discard the hand unless the visible legal sequence already supports the payoff.

- Mana: convert Dark Ritual, Lotus Petal, and Lion's Eye Diamond into a compressed Doomsday turn when waiting loses to board pressure or opposing setup. Use fast mana later when it also keeps protection online; an early Lotus Petal or Lion's Eye Diamond on the battlefield is resource storage, not an invitation to spend it into an unprotected line.

- Board: use Tamiyo, Inquisitive Student, Murktide Regent, post-board Barrowgoyf, and post-board Dauthi Voidwalker to pressure planes, block, or change the opponent's mana posture when combo is not ready. Treat permanent deployment as a commitment if it consumes mana needed for Brainstorm, Ponder, Thoughtseize, Daze, Force of Will, Doomsday, Thassa's Oracle, or Jace, Wielder of Mysteries.

- Graveyard: stock the graveyard through cantrips, fetch lands, discard, and interaction for Murktide Regent and sideboard creature plans, but do not exile or spend graveyard resources without checking whether Edge of Autumn, Daze, Force of Will pitch decisions, or a Doomsday pile needs those cards to remain available. Dauthi Voidwalker changes graveyard incentives after sideboarding; let the rules engine show replacement and exile outcomes.

- Exile: track exiled win conditions and blue cards as hard constraints. If Thassa's Oracle or Jace, Wielder of Mysteries is exiled, shift to the remaining payoff or fair pressure; if too many blue cards are exiled to Force of Will, future protection quality falls.

- Lands: lands are colored mana, shuffle access, Daze fuel, Wasteland pressure, and sometimes Edge of Autumn material. Do not sacrifice or return a land unless the resulting line still casts the next required spell.

- Sacrifice fodder: Lotus Petal, Lion's Eye Diamond, Wasteland, fetch lands, and Edge of Autumn land-sacrifice lines are commitment resources. Spend them only when the legal action text and visible state make the resulting mana, shuffle, denial, or draw immediately relevant.

- Tempo and information: Thoughtseize converts life and mana into certainty, Wasteland converts land drops into time, and Daze converts an Island into stack pressure. Sideboard bullets convert role: Fatal Push, Long Goodbye, and Bitter Triumph buy board time; Consign to Memory and Force of Negation add stack coverage; Barrowgoyf and Dauthi Voidwalker add non-combo clocks.

## Mana Guide

- Prioritize black plus blue access before utility lands. Doomsday and Dark Ritual require black, while Brainstorm, Ponder, Consider, Flow State, Tamiyo, Inquisitive Student, Thassa's Oracle, Force of Will, Daze, Murktide Regent, and Jace, Wielder of Mysteries make blue essential; Underground Sea is the cleanest default when both colors are needed.

- Fetch deliberately from Polluted Delta, Scalding Tarn, Misty Rainforest, Marsh Flats, and Flooded Strand according to the next two turns, not only the current spell. Use Snow-Covered Island when blue stability, Daze, or Wasteland resistance matters; use Snow-Covered Swamp when black stability matters; use Undercity Sewers only when its tapped timing will not cost a critical cantrip, discard, or Doomsday window.

- Sequence cantrip turns to preserve shuffle equity. Cast Brainstorm before cracking a fetch land when unwanted cards must be put back, cast Ponder before fetching when the top cards are unknown and a shuffle decision matters, and delay fetch activation when a later Brainstorm is likely and life is not under immediate pressure.

- Play lands before draw actions only when the land enables the action, protects against Daze-like tempo from the opponent, or uses mana that would otherwise be wasted. Hold a fetch land before Brainstorm, Ponder, Consider, Street Wraith, Edge of Autumn, or Flow State when the extra land information is unnecessary and the shuffle may become more valuable; Card text check required for Flow State timing.

- Keep opening hands with reliable colored mana plus action. A keep should normally have access to blue selection or black acceleration/discard, and a plausible route to Doomsday, protection, or pressure; hands with only Wasteland, Cavern of Souls, Lotus Petal, or Lion's Eye Diamond as mana need a very specific legal plan before keeping.

- Use Cavern of Souls as a payoff support land only when the rules engine exposes a relevant naming and casting line for Thassa's Oracle or another creature. Do not let Cavern of Souls replace needed black mana for Doomsday or blue mana for cantrips unless the current line is creature-payoff focused.

- Use Wasteland when denying a visible land buys a full turn, cuts off known interaction, or supports a creature-pressure plan. Avoid Wasteland when the next turn needs double colored mana, Daze recovery, Jace, Wielder of Mysteries mana, or a protected Doomsday plus Thassa's Oracle sequence.

- Spend Dark Ritual for decisive black mana turns. Prefer Dark Ritual when it casts Doomsday with protection or discard backup, but avoid using it for low-impact tempo if it is the only way to beat the opponent's clock later.

- Spend Lotus Petal for missing color, speed, or post-Doomsday precision. Treat Lion's Eye Diamond as higher risk than Lotus Petal because it discards the hand; use it only after the legal action sequence shows how the deck will still draw, cast, or resolve the payoff.

## Mulligan Guide

- Strong keeps: keep hands with Underground Sea or fetch land plus Brainstorm, Ponder, or Consider, and at least one of Doomsday, Dark Ritual, Thoughtseize, Force of Will, or Tamiyo, Inquisitive Student. A strong seven can be Polluted Delta, Underground Sea, Brainstorm, Ponder, Dark Ritual, Doomsday, Force of Will because it has colored mana, selection, a fast combo path, and stack coverage.

- Medium keeps: keep slower hands that have two colored sources, two cantrips, and one protective or pressure card. A hand like Polluted Delta, Snow-Covered Island, Ponder, Flow State, Thoughtseize, Tamiyo, Inquisitive Student, Force of Will is acceptable when the opponent is not presenting an immediate lethal clock; Card text check required before treating Flow State as a specific cantrip or combo enabler.

- Risky keeps: keep fast-mana combo hands only when the visible matchup, play/draw status, and protection density justify the risk. Dark Ritual, Lotus Petal, Doomsday, Brainstorm, Thassa's Oracle, Underground Sea, Force of Will is powerful but fragile if the blue card count, life total, or post-Doomsday draw path is not coherent.

- Automatic ships: ship hands with no land and no Lotus Petal, hands where Wasteland and Cavern of Souls are the only mana without a legal creature-payoff plan, and hands with Lion's Eye Diamond but no clear draw/payoff sequence after discarding the hand. Ship hands that contain only interaction and no Brainstorm, Ponder, Consider, Flow State, Tamiyo, Inquisitive Student, Doomsday, or Murktide Regent route.

- Matchup-dependent keeps: keep Thoughtseize plus Force of Will more aggressively into visible combo or stack decks, and keep Tamiyo, Inquisitive Student or Murktide Regent pressure hands more often against heavy discard or graveyard-light control. Keep Wasteland hands when the opponent visibly depends on a nonbasic land, but do not keep Wasteland tempo without blue selection or black action.

- Play/draw adjustment: on the play, value Thoughtseize, Daze, Wasteland, and Tamiyo, Inquisitive Student because they can constrain the opponent before shields are up. On the draw, require stronger Force of Will coverage or immediate cantrip quality, because Daze and Wasteland lose some tempo and Thoughtseize may be too slow against a turn-one engine.

- Trap hands: do not keep Brainstorm-heavy hands without a shuffle source unless the rest of the hand already functions. Do not keep Doomsday plus Thassa's Oracle hands that cannot pay for both spells across the needed turns, and do not keep Force of Will hands that exile the only blue card needed to execute the combo.

## Turn Arc

- Turn 1 preferred play: establish blue selection or black information without wasting shuffle equity. Default to fetch land for Underground Sea into Ponder, Brainstorm with a fetch held when possible, or Thoughtseize when the opponent's first turn suggests stack interaction, a faster combo, or a must-answer permanent.

- Turn 1 deviations: deploy Tamiyo, Inquisitive Student when the hand can immediately support draw density and the opponent is unlikely to punish the creature. Use Wasteland only when the visible target cuts the opponent off a critical color or turn; otherwise preserve colored mana for Brainstorm, Ponder, Thoughtseize, and Force of Will.

- Turn 2 preferred play: sculpt toward a protected Doomsday or a pressure pivot. Cast Ponder, Consider, Brainstorm, or Flow State to find Doomsday, Dark Ritual, protection, or a payoff, and use Thoughtseize before committing if the opponent has open mana or known disruption.

- Turn 2 deviations: cast Dark Ritual into Doomsday only when the line has a credible draw/payoff path and enough protection for the visible matchup. Play Lotus Petal as stored mana when it enables a near-term combo, but avoid sacrificing it for a low-impact spell if it is needed for Thassa's Oracle or Jace, Wielder of Mysteries later.

- Turn 3 preferred play: decide whether the game is a combo turn, a protected setup turn, or a fair-pressure turn. If Doomsday is protected and the clock is real, commit; if not, continue sculpting with Brainstorm or Ponder, attack with Tamiyo, Inquisitive Student when legal, or prepare Murktide Regent when graveyard resources and mana allow.

- Turn 3 deviations: use Wasteland plus Daze or Force of Will to buy a full turn when combo pieces are incomplete. Do not cast Murktide Regent if it consumes graveyard or mana resources needed for an imminent Doomsday line unless the opponent's pressure makes the creature plan safer.

- Turns 4-5 preferred play: convert accumulated selection into a decisive protected win. Use Thoughtseize to clear the path, preserve Force of Will for the opponent's decisive interaction, and choose Doomsday timing based on life total, visible attackers, open mana, and available draw actions.

- Turns 4-5 deviations: shift into Murktide Regent, Tamiyo, Inquisitive Student, Wasteland, and interaction when discard or counters make an immediate Doomsday too exposed. Use Jace, Wielder of Mysteries only when mana, board safety, and library state make the legal line clear.

- Late game preferred play: treat every action as a resource check before committing. Count remaining Doomsday, Thassa's Oracle, Jace, Wielder of Mysteries, blue cards for Force of Will, fetchable lands, and life total before selecting cantrip lines or sacrifice-mana actions.

- Late game deviations: win through fair pressure when combo payoffs are unavailable or exiled, and protect the battlefield plan with Force of Will, Daze, Thoughtseize, and Wasteland only when the exchange advances the clock. Do not use Lion's Eye Diamond late unless the visible legal sequence survives the hand discard and directly advances the payoff.

## Card Roles

- Brainstorm: treat Brainstorm as the highest-leverage sculpting spell because it fixes weak hands, hides key cards from discard, and converts fetch lands into real selection. Hold Brainstorm when possible until Polluted Delta, Scalding Tarn, Misty Rainforest, Marsh Flats, or Flooded Strand can shuffle away dead cards, but cast it earlier when the hand needs Force of Will fuel, a land, Dark Ritual, Doomsday, or a payoff immediately. After Doomsday, do not cast Brainstorm casually; use it only when the legal action sequence preserves the required draw count, mana, and library order.

- Ponder: use Ponder as the cleanest early dig spell when the hand needs a specific missing category: land, Dark Ritual, Doomsday, protection, or payoff. Keep stacked cards only when they map to the next turn cycle; shuffle when the pile contains redundant payoffs, excess lands, or cards that do not answer the current matchup. Ponder is often better than Brainstorm on turn one without a fetch because it can clear all three unknown cards.

- Consider: use Consider as a cheap instant-speed smoothing card and as a flexible post-Doomsday draw when the legal line can tolerate its surveil decision. Put a card into the graveyard only when it is not needed for the planned pile, Force of Will pitch density, Murktide Regent resources, or future land drops. Card text check required before treating any graveyard placement as deterministic in an unfamiliar rules prompt.

- Flow State: treat Flow State as a registered blue spell and potential selection or combo-support card, but do not assume exact text without runtime confirmation. Card text check required before relying on Flow State for card draw, library movement, graveyard setup, cost reduction, or deterministic Doomsday pile execution. In decisions, value it as Force of Will fuel and as a spell to inspect through legal action text before committing combo resources.

- Thoughtseize: use Thoughtseize to clear the path before Doomsday, protect a fragile Tamiyo, Inquisitive Student or Murktide Regent plan, and identify whether Force of Will should be saved for a specific card. Fire Thoughtseize early against combo and control when the opponent's unknown hand is the main risk; hold it when life total is tight or when a later discard spell can strip the exact counterspell before the combo turn. Do not spend Thoughtseize on a low-impact card if a visible clock forces a near-term Doomsday.

- Force of Will: reserve Force of Will for opposing cards that stop the win, force an immediate loss, or invalidate the current protected plan. Count blue cards before pitching: Brainstorm, Ponder, Consider, Flow State, Tamiyo, Inquisitive Student, Murktide Regent, Thassa's Oracle, Jace, Wielder of Mysteries, Daze, and Force of Will itself can matter differently depending on the line. Avoid exiling the only card needed to draw through a Doomsday pile or the only payoff that wins.

- Daze: use Daze as tempo protection when the opponent taps low, especially before or during a Doomsday turn. Returning Underground Sea or Snow-Covered Island is costly, so choose Daze only when the exchange protects a key spell, buys a turn against a fast opponent, or pairs with Wasteland to punish constrained mana. Daze gets weaker as the game goes long; do not hold it indefinitely if casting or pitching it has a better use.

- Dark Ritual: treat Dark Ritual as the primary acceleration into Doomsday and as a black-mana bridge for fast protected lines. Cast it only when the follow-up action is visible and valuable, because losing Dark Ritual to a counterspell can strand the hand. Before using Dark Ritual, count black sources, post-Doomsday life total, remaining mana for Thassa's Oracle or Jace, Wielder of Mysteries, and whether Thoughtseize should happen first.

- Lotus Petal: use Lotus Petal as flexible stored mana for combo turns, color fixing, and emergency interaction. Play it when it protects against discard, enables a near-term Doomsday, or produces a color the lands cannot provide; hold it when revealing it would expose the plan or when it might be needed after Doomsday. Do not cash Lotus Petal in for ordinary cantrips unless the hand has replacement mana and no imminent combo need.

- Lion's Eye Diamond: use Lion's Eye Diamond only when the legal sequence still wins or advances after the hand is discarded. It can be powerful in committed Doomsday lines, but it is the easiest card to misuse because it destroys reactive flexibility and can remove the payoff from hand. Do not activate it for speculative mana, and do not include it in a plan unless the next draw, cast, or payoff step is already supported by visible actions.

- Doomsday: treat Doomsday as the defining commitment card, not a normal setup spell. Cast it when the deck can survive the life-total reduction, produce the required mana, access the pile through Brainstorm, Ponder, Consider, Edge of Autumn, Street Wraith, Flow State if confirmed, or a draw step, and protect the payoff from visible or likely interaction. Avoid Doomsday into an immediate lethal board unless the current turn wins or creates a rules-confirmed survival line.

- Thassa's Oracle: use Thassa's Oracle as the cleanest primary payoff after Doomsday or after library exhaustion is legally established. Do not cast it as a value creature unless the game state makes the combo unavailable and a blocker matters, because the single copy is a critical win condition. Before choosing it, verify library size, devotion-relevant visibility if the engine exposes it, stack interaction, and whether Cavern of Souls can make the spell harder to counter.

- Jace, Wielder of Mysteries: use Jace, Wielder of Mysteries as the slower alternate payoff when mana, board safety, and library state support it. Protect Jace from combat pressure before relying on it, because resolving the planeswalker does not automatically win unless the next draw condition is legal and safe. Prefer Thassa's Oracle when mana is tight; prefer Jace when the Oracle is unavailable, discarded, exiled, or unsafe.

- Edge of Autumn: use Edge of Autumn as a single-copy draw or mana-development tool only when the legal action text confirms the mode available. Card text check required before treating it as a free post-Doomsday draw in a given prompt. If cycling by sacrificing a land is legal, check that losing the land does not remove the color needed for Thassa's Oracle, Jace, Wielder of Mysteries, Thoughtseize, or Force of Will backup.

- Street Wraith: use Street Wraith as a zero-mana draw resource when life total and pile math allow it. It is especially valuable after Doomsday because it can advance the pile without spending mana, but cycling it at low life or before knowing the needed card can be fatal. Do not cycle Street Wraith just to see a card when life total is under pressure and the hand already has a functional plan.

- Tamiyo, Inquisitive Student: use Tamiyo, Inquisitive Student as the main low-cost permanent engine and pressure bridge when the game is not ready for Doomsday. Card text check required before relying on exact transform, clue, or planeswalker behavior; use visible legal actions to decide whether attacking, drawing extra cards, or protecting Tamiyo is worthwhile. Tamiyo is strongest when cheap cantrips and Force of Will can defend a snowballing setup.

- Murktide Regent: use Murktide Regent as the fair-plan finisher when discard, graveyard texture, or opposing disruption makes immediate combo risky. Do not exile graveyard cards needed for other legal lines without checking whether Murktide Regent becomes the better win condition. It is a pressure card, not a mandatory pivot; avoid tapping out for it when Doomsday plus protection is available and the opponent is unlikely to punish the combo.

- Wasteland: use Wasteland to buy tempo, cut off a critical color, or pair with Daze and Force of Will to force the opponent into inefficient turns. Do not keep or sequence Wasteland as if it were a colored source; this deck still needs blue for selection and black for Doomsday, Dark Ritual, and Thoughtseize. Wasteland is best when it delays the opponent while the hand already has cantrips or a combo route.

- Underground Sea: treat Underground Sea as the best normal land because it casts blue selection, black disruption, Dark Ritual, and Doomsday. Fetch it early when life total and opponent pressure allow, but respect Wasteland from the opponent if basic Snow-Covered Island or Snow-Covered Swamp can cover the immediate line. Do not expose Underground Sea needlessly when the hand can operate from basics for a turn.

- Polluted Delta, Scalding Tarn, Misty Rainforest, Marsh Flats, and Flooded Strand: use fetch lands as both mana fixing and Brainstorm/Ponder quality engines. Delay cracking a fetch when Brainstorm is likely and mana is not immediately needed; crack it immediately when playing around discard, enabling Thoughtseize, or needing a specific color this turn. Track remaining fetchable lands because Doomsday piles and late-game Brainstorm decisions can fail if the mana base is depleted.

- Snow-Covered Island and Snow-Covered Swamp: use basics to preserve function through opposing land disruption and to reduce damage from fetch decisions when life matters. Snow-Covered Island supports blue cantrip starts and Force of Will backup; Snow-Covered Swamp supports Thoughtseize, Dark Ritual, and Doomsday. Fetch basics when the hand already has the other color or when Wasteland risk is the main obstacle.

- Cavern of Souls: use Cavern of Souls primarily when its visible naming and mana abilities support an uncounterable or safer creature payoff line. Do not count it as generic colored fixing for every spell; verify legal mana choices before relying on it for Tamiyo, Inquisitive Student or Thassa's Oracle. It is powerful against permission, but awkward in cantrip-heavy hands that need blue noncreature mana.

- Undercity Sewers: use Undercity Sewers as a flexible land only after checking its visible tapped status and available mana actions. Card text check required before relying on any surveil, fetchability, or color behavior not shown by the engine. Sequence it carefully because tapped or delayed mana can cost a combo turn.

## Interaction Priorities

- Discard first for information when the hand can still act after Thoughtseize. Use Thoughtseize before committing Doomsday, Lion's Eye Diamond, or Jace, Wielder of Mysteries so the decision agent sees whether the opponent has permission, fast pressure, graveyard hate, lock pieces, or a lethal follow-up. Against combo, take the card that wins or protects their win before taking a cantrip; against fair blue decks, take the counterspell or card-advantage engine that most directly beats the current combo window.

- Counter first the spell that either kills this turn or invalidates the chosen Doomsday pile. Force of Will and Daze should protect Doomsday, Thassa's Oracle, Jace, Wielder of Mysteries, and decisive card-draw steps before they protect routine cantrips. Counter discard, permanent hate, or graveyard interaction only when the visible hand or current stack shows that losing the protected card collapses the line.

- Remove first the permanent that stops the current win condition, not the most annoying permanent in isolation. With sideboard Fatal Push, Long Goodbye, or Bitter Triumph, prioritize hate creatures, taxing creatures, lethal attackers, and planeswalkers that will immediately beat Jace, Wielder of Mysteries. Do not spend removal on a small creature when Doomsday wins this turn or when Murktide Regent can stabilize combat without losing combo protection.

- Exile first graveyard-dependent engines when Dauthi Voidwalker is boarded and the opponent's public graveyard is part of their active plan. Use Dauthi Voidwalker as disruption plus pressure, but do not overvalue it against decks where the visible battlefield, stack, or hand information shows that stack interaction or creature removal is the real fight.

- Protect first the payoff, then the commitment, then the setup. Force of Will pitched to protect Thassa's Oracle is usually more valuable than Force of Will pitched to protect Ponder. Daze is best when Wasteland or visible tapped mana makes it a real counter; treat it as weak protection once the opponent can pay.

- Bait with cantrips only when the hand has redundancy. Brainstorm, Ponder, Consider, and Flow State can draw counters before Doomsday, but do not cast bait that consumes the only blue card for Force of Will or the only draw effect needed after Doomsday. Card text check required for Flow State before relying on it as selection, draw, or protection.

- Ignore low-impact pressure when the combo clock is faster. Do not trade Force of Will for a creature that cannot create lethal before the next Doomsday turn, and do not Thoughtseize a fair threat over known permission unless life total is already inside danger range after the Doomsday life reduction.

- Change posture by archetype. Against fast combo, become disruption-first and counter their engine before sculpting slowly. Against fair blue, value Thoughtseize, Cavern of Souls, redundant payoff access, and patience. Against creature pressure, preserve life total, sideboard removal, and choose Doomsday only when the current turn wins or the post-Doomsday board cannot kill you. Against prison or mana denial, prioritize basic lands, Lotus Petal, Dark Ritual, and Wasteland targets that unlock your next legal spell.

## Combat And Trading Rules

- Attack only when pressure does not weaken the combo turn. Tamiyo, Inquisitive Student and Dauthi Voidwalker can chip in while sculpting, but do not attack if a legal block or crack-back would remove the permanent needed for card flow, graveyard disruption, or survival. Card text check required before using exact Tamiyo, Inquisitive Student combat-transform assumptions.

- Preserve Thassa's Oracle as a combo payoff, not a normal attacker or blocker. Block with Thassa's Oracle only when the game is already off the primary combo plan or the block prevents immediate lethal. Trading the single copy for damage prevention is a last-resort survival line.

- Use Murktide Regent as the main fair combat pivot. Cast or defend Murktide Regent when the opponent's pressure makes waiting for a clean Doomsday unsafe, and attack when it shortens the clock without opening a lethal counterattack. Do not exile graveyard resources for Murktide Regent if the visible line needs those resources or if Doomsday with protection is already available.

- Trade Barrowgoyf aggressively only after sideboarding into a fairer posture. Barrowgoyf should pressure planeswalkers, block large attackers, and force opponents to spend removal away from Doomsday, but do not let fair combat distract from a protected combo window. Card text check required for exact sizing or abilities.

- Protect Jace, Wielder of Mysteries from attackers before relying on it. If Jace is the chosen payoff, removal and blockers should prioritize creatures that can attack it down before the next draw condition resolves. Do not tap out for Jace on a board where visible attacks kill it unless the same turn can legally draw from an empty library.

- Respect life thresholds around Doomsday, fetch lands, Street Wraith, and Thoughtseize. If the opponent has visible attackers, burn-like pressure, or a short combat clock, treat every life payment as part of the combo cost. Avoid Street Wraith cycling and unnecessary fetch-shock-equivalent decisions when the resulting life total dies to the visible board after Doomsday halves life.

- Block to survive, not to preserve style points. When the legal board shows lethal next combat, trade Tamiyo, Inquisitive Student, Dauthi Voidwalker, Barrowgoyf, or Murktide Regent if that keeps a protected combo turn alive. When life is high and a combo turn is imminent, prefer keeping creatures that pressure, disrupt, or guard Jace, Wielder of Mysteries.

- Do not manufacture combat tricks this deck does not show. The registered main deck has stack interaction and combo tools, not pump or protection combat tricks. If the engine offers an unexpected combat action from a resolved card, follow legal action text and visible outcomes; otherwise assume combat is about racing, blocking, and preserving key permanents.

## Selection And Tutor Rules

- Preserve cantrips until they answer a concrete question. Brainstorm, Ponder, Consider, Street Wraith, Edge of Autumn, and any verified Flow State draw mode are strongest when they either find Doomsday, find protection, make a land drop, or draw through a post-Doomsday pile. Do not spend the last draw effect before casting Doomsday unless the visible hand still has another legal way to access the pile.

- Use Ponder before fetch lands when the hand needs raw selection. If Ponder sees a keepable combination of mana, Doomsday, protection, or payoff access, keep the order and avoid shuffling. If the visible top cards do not solve the current bottleneck, shuffle with Polluted Delta, Scalding Tarn, Misty Rainforest, Marsh Flats, or Flooded Strand before the next draw step when legal.

- Use Brainstorm with shuffle access to repair hands, not to hide indecision. Put back excess legendary/payoff pieces, redundant lands, or cards that are not needed before the combo turn, then shuffle them away when a fetch land is legal. Keep Brainstorm uncast when the hand needs instant-speed concealment from discard or needs a draw effect after Doomsday.

- Treat Doomsday as the real tutor commitment. Before selecting a pile, identify the visible win route: Thassa's Oracle with enough library depletion, Jace, Wielder of Mysteries plus a legal draw, or a protected delayed line. The pile should contain the payoff, the draw steps, and the mana/protection needed from the current board; do not build a pile that assumes hidden cards, unverified Flow State text, or a future legal action the engine has not exposed.

- Keep post-Doomsday draw sequencing exact. Street Wraith and Edge of Autumn are especially valuable because they can draw from the pile without spending normal cantrip mana in many lines, but use them only when life total, land sacrifice, and current library size make the action legal and safe. If Thassa's Oracle or Jace, Wielder of Mysteries is already in hand, selection should usually find mana, protection, or the final draw rather than another payoff.

- Use Thoughtseize as selection by subtraction before the commitment turn. When the hand can combo soon, Thoughtseize should reveal whether Force of Will, Daze, Cavern of Souls, Lotus Petal, Lion's Eye Diamond, or Dark Ritual is enough protection and mana. If Thoughtseize is drawn after Doomsday, cast it only when the pile and life total still support the line.

- Sequence land drops around information. Fetch Underground Sea when both black and blue are needed now; fetch Snow-Covered Island or Snow-Covered Swamp when Wasteland, life pressure, or mana denial makes basics important. Hold Cavern of Souls until the payoff creature line matters when possible, because naming and timing should follow the visible route to Thassa's Oracle. Use Wasteland as disruption only when denying the opponent's key mana is stronger than preserving your own spell sequencing.

- Respect uncertain card text. Card text check required for Flow State and Tamiyo, Inquisitive Student before relying on them for exact selection, transform timing, card draw, or graveyard setup. If the engine exposes a legal action from either card, choose from visible legal text and current board needs rather than assumed paper text.

## Priority And Stack Rules

- Commit Doomsday only through a deliberate priority gate. Before casting it, confirm visible mana for the whole line, at least one route to the payoff, a plan for known interaction, and life total high enough to survive the immediate board after the life-loss effect. If waiting adds protection or a required draw without giving the opponent lethal or a lock, waiting is often correct.

- Protect the stack piece that wins, not the spell that merely improves texture. Force of Will and Daze should usually defend Doomsday, Thassa's Oracle, Jace, Wielder of Mysteries, or the decisive post-Doomsday draw before defending Brainstorm, Ponder, Consider, or Flow State. Pitch blue cards only after confirming the remaining hand still contains the mana, draw, and payoff path.

- Let low-impact spells resolve when they do not change the combo race. Do not spend Force of Will on a fair threat, cantrip, or removal spell unless the visible battlefield, hand knowledge, or current stack shows it beats the planned line. Counter the opponent's lethal spell, lock piece, discard that takes the only payoff, or permission that stops the current win.

- Use Lion's Eye Diamond only when priority and card access support it. Do not activate Lion's Eye Diamond before the hand can tolerate being discarded or before the engine shows the relevant spell/ability timing. In Doomsday lines, crack it only when the chosen pile, draw effect, or payoff line explicitly accounts for losing the current hand.

- Manage instant-speed draw with library size. Street Wraith, Edge of Autumn, Brainstorm, Consider, and verified Flow State actions can be lethal enablers or self-loss risks after Doomsday. Before taking a draw action with an empty or near-empty library, verify whether Thassa's Oracle, Jace, Wielder of Mysteries, or another legal replacement/win condition is already resolving or present.

- Use Thassa's Oracle timing as a rules-engine decision, not a slogan. Cast it when the current library size and devotion/trigger state shown by the engine can win or when it must be used as a setup creature in an emergency. Protect the trigger or the spell according to what the opponent can actually interact with from visible mana, known cards, and stack actions.

- Treat Jace, Wielder of Mysteries as a tap-out commitment. Resolve Jace only when the board cannot immediately remove it before the draw condition matters, or when the same turn can legally draw from an empty library. If Jace is threatened on stack or battlefield, prioritize counters and removal according to whether Jace is the active win condition.

- Use Tamiyo, Inquisitive Student and Murktide Regent priority actions conservatively. Card text check required for exact Tamiyo abilities; activate or transform only when the engine exposes legal value that advances combo, protection, or survival. Cast Murktide Regent when a fair clock is needed, but do not exile resources or tap mana that the active Doomsday line needs.

- Decline optional payments that weaken the combo turn. Lotus Petal, Dark Ritual, fetch lands, Force of Will life/card costs, Thoughtseize life loss, and Street Wraith cycling all trade resources for speed or protection. Take the optional or life-payment action only when it advances a legal line faster than it exposes the deck to visible lethal or stack collapse.

## Sideboard Map

- Use sideboarding to change the failure mode, not the deck identity. Doomsday, Thassa's Oracle, Jace, Wielder of Mysteries, Dark Ritual, Brainstorm, Ponder, Polluted Delta, Underground Sea, and the core blue interaction should remain the default center unless the matchup forces a fair backup plan. Bring in sideboard cards when they answer a specific visible axis: graveyards, creature pressure, stack fights, colorless/permanent disruption, or attrition.

- Add Barrowgoyf against discard-heavy, removal-heavy, counter-heavy, or graveyard-interactive opponents where resolving Doomsday through one protected turn is less reliable. Barrowgoyf changes the role into a hybrid deck that can pressure while holding Force of Will, Daze, Thoughtseize, and cantrips, but it is weaker when the opponent ignores creatures, races with fast combo, or presents exile-based graveyard pressure. When Barrowgoyf is added, reduce main-deck emphasis on fragile all-in speed, excess self-damage, and narrow delayed payoff pieces rather than reducing the blue card count too far.

- Add Bitter Triumph against large creatures, planeswalkers, hate permanents that become creatures only if the engine exposes them as legal targets, and creature-combo pieces that Fatal Push or Long Goodbye cannot answer. Bitter Triumph is bad when the matchup is stack-only, when discard/life payments make Doomsday unsafe, or when the visible hand cannot afford another nonblue card. Treat its additional cost as real; do not spend the card or life resource if that cost breaks the planned Doomsday pile or removes the only protection spell.

- Add Consign to Memory against artifact, colorless, Eldrazi-style, triggered-ability, and permanent-based disruption where the legal action text shows it can interact. Card text check required before relying on exact modes, replicate, or trigger coverage, but use it as a flexible answer to effects that Force of Will or Daze may not line up against cleanly. It is weaker against creature swarms, discard mirrors, and opponents whose critical threats are cheap black or red creatures.

- Add Dauthi Voidwalker against graveyard combo, recursion engines, reanimator plans, and fair decks that rely on graveyard value while also giving Doomsday a secondary threat. Dauthi Voidwalker is bad when the opponent has little graveyard reliance, when the matchup is about immediate stack speed, or when black mana is already strained by Dark Ritual, Thoughtseize, and Doomsday. Do not assume hidden graveyard cards; use it when public graveyards, known deck role, or revealed cards make the hate relevant.

- Add Fatal Push against fast creature pressure, mana creatures, hate creatures, and early attackers that shorten the Doomsday clock. Fatal Push is poor against combo, big noncreature engines, and opponents whose creatures are too large or protected by visible rules text. Sequence fetch lands with Fatal Push only when the engine shows the removal line is legal and the life/mana cost does not weaken the combo turn.

- Add Force of Negation against fast combo, prison pieces, opposing permission, discard-backed engines, and noncreature spells that stop Doomsday or Thassa's Oracle. Force of Negation is less attractive against creature-heavy pressure where the exile/pitch cost leaves the hand unable to assemble a pile. Preserve enough blue cards after sideboarding; if Force of Negation enters, reduce nonblue slow cards before diluting the pitch density.

- Add Long Goodbye against cheap hate creatures, small utility creatures, and low-toughness pressure where uncounterability or removal reliability matters. Card text check required for exact targeting restrictions and counter-prevention details. Long Goodbye is weaker against large threats, stack combo, graveyard combo without creatures, and board states where a single removal spell does not buy a full turn.

Versus Delver-style blue tempo with cheap threats and permission
Role cards: 4 Barrowgoyf; 2 Fatal Push; 1 Long Goodbye; 1 Bitter Triumph; 2 Force of Negation
Trim roles: 1 Jace, Wielder of Mysteries; 1 Street Wraith; 1 Edge of Autumn; 1 Consider; 1 Lion's Eye Diamond; 1 Daze; 1 Flow State; 1 Wasteland; 1 Murktide Regent; 1 Thoughtseize

- Prioritize this plan when the opponent pressures life total while holding up counters. Barrowgoyf and removal buy time, Force of Negation increases stack density, and the deck can win either through a protected Doomsday or a fair threat. Keep Thassa's Oracle because it remains the cleanest payoff. Be cautious with Thoughtseize and Street Wraith effects when life total is under visible pressure.

Versus fast spell combo and stack mirrors
Role cards: 2 Force of Negation; 3 Consign to Memory; 2 Dauthi Voidwalker
Trim roles: 2 Murktide Regent; 1 Jace, Wielder of Mysteries; 1 Edge of Autumn; 1 Street Wraith; 1 Flow State; 1 Wasteland

- Prioritize this plan when the opponent races on the stack or uses graveyard resources as part of the combo. Force of Negation and Consign to Memory increase interaction density while Dauthi Voidwalker pressures graveyard lines without abandoning the combo. Keep Thoughtseize high priority because revealed information decides whether Doomsday can be cast safely. Reduce fair-threat emphasis when speed and stack protection matter more than battlefield combat.

Versus graveyard recursion or reanimation shells
Role cards: 2 Dauthi Voidwalker; 2 Force of Negation; 3 Consign to Memory
Trim roles: 2 Murktide Regent; 1 Jace, Wielder of Mysteries; 1 Edge of Autumn; 1 Street Wraith; 1 Consider; 1 Flow State

- Prioritize this plan when public or revealed information shows graveyard dependency. Dauthi Voidwalker is both hate and a clock, while Force of Negation protects against the noncreature spell that starts the engine. Consign to Memory should be held for legal high-impact targets rather than spent just because it is available. Do not overvalue graveyard hate if the opponent has already pivoted to ordinary creature combat.

Versus creature-heavy fair decks and hate-creature decks
Role cards: 4 Barrowgoyf; 2 Fatal Push; 1 Long Goodbye; 1 Bitter Triumph
Trim roles: 1 Jace, Wielder of Mysteries; 1 Street Wraith; 1 Edge of Autumn; 1 Consider; 1 Lion's Eye Diamond; 1 Flow State; 1 Wasteland; 1 Daze

- Prioritize this plan when the opponent's main disruption is damage plus permanents on the battlefield. Removal clears hate creatures or protects life total, and Barrowgoyf creates a board plan that forces the opponent to respect combat. Doomsday remains the best finish when the battlefield is stabilized, but avoid paying life for Thoughtseize or Street Wraith when the visible clock makes the half-life payment unsafe.

Versus artifact, colorless, or prison-style disruption
Role cards: 3 Consign to Memory; 2 Force of Negation; 1 Bitter Triumph
Trim roles: 1 Street Wraith; 1 Edge of Autumn; 1 Consider; 1 Jace, Wielder of Mysteries; 1 Wasteland; 1 Flow State

- Prioritize this plan when the opponent presents noncreature permanents, colorless threats, or stack objects that block the combo. Consign to Memory and Force of Negation should protect the window where Doomsday resolves and the pile is executed. Bitter Triumph is included as a catch-all only when legal target text supports it; do not hold it as an answer to a permanent type it cannot legally target.

- Keep sideboarding reversible after Game 2. If the opponent removes creature answers, Barrowgoyf becomes better; if the opponent adds more graveyard hate or removal, return toward the compact Doomsday plan with higher cantrip and stack density. If the opponent reveals permanent hate that is not covered by the current plan, favor Consign to Memory and Force of Negation over slow fair threats.

- Preserve mana coherence after every plan. Sideboard cards increase black and blue demands, so fetch Underground Sea when double-function mana is required, use Snow-Covered Island or Snow-Covered Swamp only when the visible matchup rewards basic protection, and avoid keeping post-board hands that cannot cast both the sideboard interaction and Doomsday setup on time.

Explicit Sideboard Repair Plans

These balanced plans are legal Veles candidates built from the registered sideboard and main deck. Use them as baseline sideboarding options only when the matchup role fits; keep the role guidance above as the strategic source of truth.

Legal repair plan 1
Side in: 4 Barrowgoyf
Cut: 3 Thoughtseize; Ponder

Legal repair plan 2
Side in: 3 Barrowgoyf; Bitter Triumph
Cut: 2 Thoughtseize; 2 Ponder

Legal repair plan 3
Side in: 2 Barrowgoyf; Bitter Triumph; Consign to Memory
Cut: Thoughtseize; 3 Ponder

Legal repair plan 4
Side in: Barrowgoyf; Bitter Triumph; 2 Consign to Memory
Cut: 3 Ponder; Flow State

## Matchup Guidance

- Aggro: Protect life total before sculpting a perfect pile. Fast creature decks punish Thoughtseize, Street Wraith, fetch lands, and Doomsday's life payment, so prefer hands with early black mana, Fatal Push, Long Goodbye, Bitter Triumph, Barrowgoyf, or a protected fast combo path. Use Brainstorm, Ponder, Consider, and Flow State to find either removal plus time or Doomsday plus a deterministic payoff; Card text check required for Flow State before treating it as a specific speed or selection tool. Add role cards: Barrowgoyf, Fatal Push, Long Goodbye, Bitter Triumph. Reduce main-deck emphasis: Jace, Wielder of Mysteries, Street Wraith, Edge of Autumn, and slow fair-threat lines when the visible clock is short.

- Burn: Treat every life payment as a strategic cost, not a free setup action. Thoughtseize is still valuable when it clears the exact visible or revealed card that stops the combo, but it becomes dangerous when life total is already low or Doomsday would leave no buffer. Fetch Underground Sea only when the color requirement matters; prefer basic lands when the engine presents a safe route and Wasteland protection matters less than preserving life. Barrowgoyf can buy turns if it blocks profitably, but the primary plan is still a compact Doomsday turn with Force of Will, Daze, Force of Negation, or Thoughtseize protecting the decisive action.

- Tempo: Respect the combined pressure of a cheap threat plus permission. Against blue tempo, do not cast Doomsday into open interaction unless the hand can force through the spell, win immediately afterward, or the visible clock makes waiting worse. Wasteland can be a real tactical tool here if it cuts the opponent off a key color without delaying black-black access for Doomsday. Add role cards: Barrowgoyf, Fatal Push, Long Goodbye, Bitter Triumph, Force of Negation. Reduce main-deck emphasis: Jace, Wielder of Mysteries, Lion's Eye Diamond, Street Wraith, and speculative cantrip chains that expose the deck to pressure without improving the combo window.

- Control: Build the hand toward a protected decisive turn instead of trading resources randomly. Thoughtseize is highest value when it checks whether Doomsday, Thassa's Oracle, Jace, Wielder of Mysteries, Lion's Eye Diamond, or a cantrip payoff line can resolve through known interaction. Force of Will and Force of Negation should defend Doomsday or the payoff unless the opposing spell would end the game or remove the only combo route. Tamiyo, Inquisitive Student and Murktide Regent matter as fair threats when the opponent has overloaded on stack answers, but do not abandon the combo if the engine exposes a protected win.

- Combo: Race with information and protection rather than defaulting to fair pressure. Thoughtseize should prioritize the card that starts the opposing engine, the card that protects it, or the card that stops your own Doomsday line, based only on revealed choices and public stack context. Force of Will, Daze, Force of Negation, and Consign to Memory should be conserved for decisive noncreature action windows unless the legal action list shows no future protection need. Add role cards: Force of Negation, Consign to Memory, Dauthi Voidwalker when graveyard use is public or strongly indicated by revealed information. Reduce main-deck emphasis: Murktide Regent and slow Jace, Wielder of Mysteries lines when speed is decisive.

- Midrange: Preserve card quality while keeping a fast win available. Midrange decks often combine discard, removal, and a moderate clock, so use Brainstorm to hide critical cards when legal timing and visible information support it, then rebuild with Ponder, Consider, and Flow State. Tamiyo, Inquisitive Student and Barrowgoyf can pressure or defend through removal-heavy games, while Doomsday remains the cleanest way to end a stalled board. Do not overboard into only creatures; the opponent's removal makes fair threats useful as a pivot, not a replacement for Thassa's Oracle or Jace, Wielder of Mysteries.

- Removal-heavy decks: Convert dead opposing removal into a combo advantage when possible. If the opponent has many creature answers but limited stack pressure, keep the Doomsday plan dense and avoid leaning too hard on Barrowgoyf, Tamiyo, Inquisitive Student, or Murktide Regent unless they force the opponent to tap mana or spend a turn. Thoughtseize should take discard, stack interaction, or permanent hate before ordinary removal unless a creature is the only current path to stabilize. Bitter Triumph, Fatal Push, and Long Goodbye are still useful if the removal deck presents hate creatures or a single threat that shortens the combo clock.

- Big mana: Pressure the opponent's setup while protecting against the payoff turn. Wasteland is valuable when the legal land target visibly constrains the opponent's next turn more than it constrains your black mana. Consign to Memory and Force of Negation should be saved for high-impact colorless, artifact, enchantment, or noncreature threats when their text and legality fit; Card text check required for exact Consign to Memory scope in each game state. Doomsday should be cast before the opponent's mana engine makes multiple disruptive actions likely, provided the hand can execute or protect the pile.

- Graveyard decks: Use graveyard hate as a clock plus disruption, not as a reason to stop advancing. Dauthi Voidwalker is strongest when public graveyards, revealed cards, or matchup role show recursion, reanimation, escape-like resources, or graveyard combo. Force of Negation and Consign to Memory should cover the noncreature enabler when Dauthi Voidwalker is not enough or is not yet active. Murktide Regent may be worse if graveyards are contested or if eating your own graveyard weakens another line; do not assume hidden graveyard plans without engine-visible evidence.

- Artifact/enchantment decks: Identify whether the problem is a permanent already on board, a spell on the stack, or a mana engine. Consign to Memory and Force of Negation are the main sideboard tools for stack-based artifact, enchantment, colorless, or prison pressure, but they must be used only on legal targets the engine exposes. Bitter Triumph can be included as flexible interaction only when the visible permanent type and card text make it legal; Card text check required for exact Bitter Triumph target range. Wasteland should attack mana when it buys a full turn or opens a protected Doomsday window.

- Go-wide decks: Stabilize the battlefield only long enough to win. Fatal Push and Long Goodbye should remove the creature that represents the fastest damage, a hate effect, or the best combat leverage; do not spend removal on low-impact bodies when Doomsday can win before combat matters. Barrowgoyf is useful as a blocker that changes attacks, while Murktide Regent can close once life is stable. Avoid Doomsday lines that pass the turn at a life total where visible attackers already represent lethal.

- Single-threat decks: Answer or race the one object that matters. Fatal Push, Long Goodbye, Bitter Triumph, Daze, Force of Will, and Force of Negation should be assigned based on whether the threat is on the stack, on the battlefield, a creature, or a noncreature permanent. If the single threat has already resolved and cannot be legally answered, shift to the fastest Doomsday or Thassa's Oracle line rather than cantripping for perfect protection. Barrowgoyf and Murktide Regent can race if the engine shows combat is favorable, but the decision agent should not infer hidden safety from an empty visible hand alone.

## Specific Matchup Notes

- General/archetype-only note: Exact opponents are not supplied, so revealed cards, public zones, and rules-engine legal actions override these assumptions. Use these notes as matchup priors for Doomsday, not as permission to infer hidden cards or force an illegal line.

- Fast creature pressure: Treat life total as a combo resource that can run out immediately after Doomsday. Add role cards: Fatal Push, Long Goodbye, Bitter Triumph, Barrowgoyf. Reduce main-deck emphasis: Jace, Wielder of Mysteries, slow Murktide Regent pivots, speculative Street Wraith cycles, and unprotected cantrip turns that do not produce Doomsday or removal. Priority targets are visible hate creatures, the highest-damage attacker, and any threat that makes passing after Doomsday lethal.

- Blue control or stack-heavy shells: Build toward a protected decisive turn instead of trading Force of Will, Daze, or Force of Negation for low-impact spells. Add role cards: Force of Negation, Consign to Memory when legal target classes matter; Card text check required for exact Consign to Memory coverage. Reduce main-deck emphasis: creature removal and fair threats when they do not pressure planeswalkers, life total, or mana. Priority targets are stack interaction, discard that breaks the protected hand, and permanents that stop Thassa's Oracle or Jace, Wielder of Mysteries from winning.

- Combo mirrors and faster engines: Race with Thoughtseize plus free interaction, then commit Doomsday when waiting gives the opponent a cleaner turn. Add role cards: Force of Negation, Consign to Memory, Dauthi Voidwalker when public graveyard use is relevant. Reduce main-deck emphasis: Murktide Regent and long fair plans. Priority targets are the visible engine starter, the protection spell that forces through that engine, or the disruption that stops your own Doomsday turn.

- Graveyard-centric opponents: Deploy Dauthi Voidwalker only when it meaningfully disrupts public graveyard plans or accelerates pressure; do not treat it as a reason to stop assembling Doomsday. Add role cards: Dauthi Voidwalker, Force of Negation, Consign to Memory, Barrowgoyf if its size and combat role are confirmed; Card text check required for exact Barrowgoyf sizing. Reduce main-deck emphasis: Murktide Regent when graveyard pressure makes delve-like resource use risky. Priority targets are graveyard enablers, payoff spells, and removal aimed at Dauthi Voidwalker when it is the active disruption.

- Prison, artifact, enchantment, or colorless pressure: Decide whether Wasteland, Force of Will, Force of Negation, or Consign to Memory is the correct answer based on whether the problem is mana, stack, or resolved permanent. Add role cards: Consign to Memory, Force of Negation, Bitter Triumph only when its legal target text applies; Card text check required. Reduce main-deck emphasis: slow Jace, Wielder of Mysteries lines that fold to lock pieces. Priority targets are effects that stop casting Doomsday, stop drawing cards, prevent Thassa's Oracle from resolving, or remove black mana access.

- Midrange discard/removal decks: Preserve the combo core while using Tamiyo, Inquisitive Student, Barrowgoyf, and Murktide Regent as pressure or insulation. Add role cards: Barrowgoyf, Bitter Triumph, Fatal Push, Long Goodbye, Force of Negation where noncreature haymakers matter. Reduce main-deck emphasis: Lion's Eye Diamond and fragile all-in lines when visible discard or removal has already reduced redundancy. Priority targets are discard, permanent hate, and the threat that shortens the Doomsday window.

## Risk Summary

- Mana risk: Doomsday demands stable black access, and the deck can lose by spending Wasteland, Lotus Petal, Lion's Eye Diamond, fetchlands, or Dark Ritual in an order that strands Underground Sea, Snow-Covered Swamp, Cavern of Souls, or payoff mana. Protect black mana before utility land pressure unless Wasteland visibly denies the opponent a decisive turn.

- Matchup risk: The deck changes roles sharply after sideboarding, and overcommitting to Barrowgoyf, Dauthi Voidwalker, Fatal Push, Long Goodbye, or Bitter Triumph can dilute the Doomsday kill. Keep enough Brainstorm, Ponder, Consider, Flow State, Dark Ritual, Doomsday, Thassa's Oracle, and protection to preserve a real combo density.

- Draw risk: Brainstorm, Ponder, Consider, Flow State, Edge of Autumn, and Street Wraith can improve selection, but blind cantrip chaining under pressure can spend the turn without changing survival or combo readiness. Choose selection with a concrete need: mana, Doomsday, protection, payoff, or a removal answer.

- Graveyard risk: Murktide Regent, Dauthi Voidwalker, and Barrowgoyf may pull the deck toward graveyard-aware games, but the primary win still depends on resolving and executing Doomsday. Do not consume or contest graveyard resources in a way that weakens the visible winning line without a clear board reason.

- Sweeper/removal risk: Creature pivots are vulnerable to opposing removal and sweepers, while Tamiyo, Inquisitive Student and Murktide Regent may invite the opponent to make dead cards live. Use fair threats to buy time, force action, or punish overboarding, not as a default replacement for Thassa's Oracle and Jace, Wielder of Mysteries.

- Closer risk: Thassa's Oracle is the cleanest payoff, while Jace, Wielder of Mysteries is slower and more exposed to battlefield and mana constraints. Do not commit Doomsday without knowing whether the legal follow-up route is Oracle-based, Jace-based, or a delayed pile that survives visible pressure.

- Interaction risk: Force of Will, Daze, Force of Negation, Consign to Memory, Thoughtseize, Fatal Push, Long Goodbye, and Bitter Triumph answer different problem types. Match the answer to the visible card type, stack timing, and legality instead of spending the first available interaction.

- Sequencing risk: The deck loses percentage when it exposes Doomsday before checking interaction, cracks Lion's Eye Diamond before the legal payoff window, cycles Street Wraith at unsafe life totals, or casts Dark Ritual before deciding whether the opponent can punish the mana burst. Treat every all-in action as a commitment gate.

## Test Feedback Checklist

- Deciding factor: Record whether the game was decided by resolving Doomsday, failing to find Doomsday, executing Thassa's Oracle or Jace, Wielder of Mysteries, pivoting through Murktide Regent, or losing before the combo turn. Note the exact turn, life total, protection available, and visible opponent pressure when the decisive commitment happened.

- Mulligans: Check whether opening hands kept a credible path to black mana, Doomsday, selection, and protection. Flag hands that kept Brainstorm, Ponder, Consider, or Flow State without enough mana or shuffle access from Polluted Delta, Scalding Tarn, Misty Rainforest, Marsh Flats, Flooded Strand, or another visible land line.

- Mana: Review whether Underground Sea, Snow-Covered Swamp, Snow-Covered Island, Undercity Sewers, Cavern of Souls, Lotus Petal, Lion's Eye Diamond, Dark Ritual, and Wasteland were sequenced toward the actual win condition. Mark any game where Wasteland pressure or early utility mana delayed Doomsday, Thassa's Oracle, Jace, Wielder of Mysteries, or protection.

- Velocity: Count whether Brainstorm, Ponder, Consider, Flow State, Edge of Autumn, and Street Wraith produced a concrete missing resource: land, Doomsday, protection, payoff, or sideboard interaction. Flag cantrip turns that improved card quality but did not change survival, combo readiness, or the opponent's clock.

- Engines: Evaluate whether Tamiyo, Inquisitive Student and Murktide Regent bought time, forced action, or distracted removal, rather than pulling the pilot away from the combo. Record whether their presence made Force of Will pitch decisions, graveyard use, or race math better or worse.

- Disruption: Review every Thoughtseize, Force of Will, Daze, Force of Negation, Consign to Memory, Fatal Push, Long Goodbye, and Bitter Triumph decision by target type and timing. Mark whether interaction stopped a decisive opposing line, protected Doomsday, preserved the payoff turn, or traded for a low-impact spell.

- Sideboard: After each post-board game, record whether Barrowgoyf, Dauthi Voidwalker, Fatal Push, Long Goodbye, Bitter Triumph, Consign to Memory, and Force of Negation addressed the actual visible problems. Flag plans that added fair cards but left too few combo, mana, velocity, or protection pieces.

- Closing: Identify whether the pilot chose the correct closer among Thassa's Oracle, Jace, Wielder of Mysteries, Murktide Regent, and post-board creature pressure. Mark any game where Doomsday resolved but the follow-up failed because mana, draw access, life total, or protection was miscounted.

- Role: Record whether the pilot was the racer, protected combo deck, control deck, or fair-pressure deck after sideboarding. Flag role conflicts where Thoughtseize and Force of Will were spent defensively while the battlefield demanded racing, or where Murktide Regent and Barrowgoyf were pursued while a protected Doomsday was available.

- Mistakes: Tag visible mistakes as mana sequencing, premature commitment, overprotected pass, unsafe Street Wraith cycle, weak Brainstorm lock, missed Wasteland timing, poor Force of Will pitch, wrong Thoughtseize card, or sideboard dilution. Do not mark a mistake when the rules engine did not expose a legal alternative.

- Stranded cards: Track copies of Doomsday, Dark Ritual, Lion's Eye Diamond, Lotus Petal, Thassa's Oracle, Jace, Wielder of Mysteries, Force of Will, Daze, and sideboard cards that stayed unusable. Note whether they were stranded by color, timing, opponent pressure, card type mismatch, or earlier sequencing.

- Overperformers and underperformers: Record when Tamiyo, Inquisitive Student, Murktide Regent, Barrowgoyf, Dauthi Voidwalker, or Wasteland materially changed the game. Separate actual wins or survival turns from cards that merely looked strong while the combo plan stalled.

## First Tuning Questions

- Doomsday density: If losses repeatedly come from never finding Doomsday, should the deck preserve more Ponder, Brainstorm, Consider, Flow State, or cantrip-heavy keeps instead of leaning harder on Murktide Regent or Barrowgoyf pivots?

- Protection density: If Doomsday resolves rarely through blue decks, is the current mix of Force of Will, Daze, Thoughtseize, Force of Negation, and Consign to Memory aligned with the threats being faced, or are protection slots mismatched by card type and timing?

- Mana structure: If black mana or post-Doomsday payoff mana is frequently short, should Wasteland usage be more conservative, should Cavern of Souls be treated as payoff-specific rather than setup mana, or should fetchland sequencing prioritize Underground Sea and Snow-Covered Swamp more aggressively?

- Fast aggro plan: If creature pressure beats the deck before Doomsday is safe, are Fatal Push, Long Goodbye, Bitter Triumph, and Barrowgoyf enough after sideboarding, or is the plan diluting velocity without reliably extending the clock?

- Control plan: If long games are lost with unused fair threats, should Murktide Regent, Tamiyo, Inquisitive Student, and Barrowgoyf be framed as pressure that forces action before Doomsday, not as independent default closers?

- Combo mirror plan: If faster combo wins through disruption, should Thoughtseize and free interaction be prioritized over cantrip sculpting, and should Force of Negation or Consign to Memory receive more matchup weight when their legal target classes are confirmed? Card text check required for exact Consign to Memory coverage.

- Closer balance: If Thassa's Oracle is disrupted or unavailable too often, is Jace, Wielder of Mysteries a real backup in practice, or does its mana and timing cost make Murktide Regent pressure the more reliable non-Oracle route?

- Sideboard slot pressure: If Dauthi Voidwalker, Barrowgoyf, Fatal Push, Long Goodbye, Bitter Triumph, Force of Negation, or Consign to Memory stay stranded, identify whether the issue is matchup selection, mana, timing, or the card's legal target profile before changing quantities.

- Role conflict: If post-board games show the deck half-racing and half-controlling, ask whether sideboard plans are protecting Doomsday or transforming into fair pressure. The list should not split resources so thinly that neither plan closes.

## Veles Tactical Policy

### Policy: Opening Hand Combo Gate
- Priority: High
- Decision families: mulligan
- Cards: Doomsday; Dark Ritual; Brainstorm; Ponder; Flow State; Thoughtseize; Force of Will; Lotus Petal; Lion's Eye Diamond; Underground Sea; Polluted Delta
- Phase windows: pregame mulligan decisions.
- Runtime cues: prompt:mulligan; opening hand visible.
- Use when: choosing keep or mulligan with full hand contents visible.
- Avoid when: game already began or sideboard decision is pending.
- Instructions: Keep hands with black mana, a route to Doomsday, and either protection or velocity; reject hands that only cantrip without mana, only interact without a clock, or cannot cast black spells soon.
- Pilot skill floor: advanced.
- No-API allowed: no
- Light-model allowed: yes

### Policy: Early Setup Before Commitment
- Priority: Medium
- Decision families: mana, selection, priority
- Cards: Brainstorm; Ponder; Consider; Flow State; Tamiyo, Inquisitive Student; Polluted Delta; Scalding Tarn; Misty Rainforest; Marsh Flats; Flooded Strand; Underground Sea
- Phase windows: turns one through three main phases and end steps.
- Runtime cues: action:cast; action:activate; visible hand lacks a protected Doomsday line.
- Use when: the current turn can improve mana, protection, or combo access before committing.
- Avoid when: opponent pressure makes waiting lethal or Doomsday plus payoff is already protected.
- Instructions: Prioritize land stability and card selection toward Doomsday, black mana, draw-after-Doomsday access, and protection; treat Tamiyo, Inquisitive Student as setup only when it does not delay the combo turn.
- Pilot skill floor: intermediate.
- No-API allowed: no
- Light-model allowed: yes

### Policy: Fetchland Color Discipline
- Priority: Medium
- Decision families: mana
- Cards: Polluted Delta; Scalding Tarn; Misty Rainforest; Marsh Flats; Flooded Strand; Underground Sea; Snow-Covered Island; Snow-Covered Swamp; Undercity Sewers
- Phase windows: any priority window with fetchland activation legal.
- Runtime cues: action:activate Polluted Delta; action:activate Scalding Tarn; action:activate Misty Rainforest; action:activate Marsh Flats; action:activate Flooded Strand
- Use when: a fetchland activation is legal and mana choice affects current or next-turn combo access.
- Avoid when: an existing mana source already satisfies all visible costs and life/shuffle timing matters more.
- Instructions: Fetch Underground Sea when both black and blue are needed soon; fetch basics when visible Wasteland risk or life/resource constraints make dual exposure costly; preserve shuffle effects for Brainstorm when the hand needs cleanup.
- Pilot skill floor: intermediate.
- No-API allowed: no
- Light-model allowed: yes

### Policy: Doomsday Commitment Gate
- Priority: High
- Decision families: priority, mana, interaction
- Cards: Doomsday; Dark Ritual; Lotus Petal; Lion's Eye Diamond; Thoughtseize; Force of Will; Daze; Thassa's Oracle; Jace, Wielder of Mysteries
- Phase windows: own main phases, rarely protected response windows.
- Runtime cues: action:cast Doomsday
- Use when: Doomsday is legal to cast and the pilot must decide whether this is the decisive turn.
- Avoid when: the visible line cannot access a payoff, draw step, or protection before the opponent can win.
- Instructions: Cast Doomsday only when mana, life, draw access, and protection support a complete plan; account for visible opposing clock, open mana, known disruption, and whether waiting loses more than committing.
- Pilot skill floor: expert.
- No-API allowed: no
- Light-model allowed: yes

### Policy: Doomsday Pile Construction
- Priority: High
- Decision families: selection
- Cards: Doomsday; Thassa's Oracle; Jace, Wielder of Mysteries; Street Wraith; Edge of Autumn; Lion's Eye Diamond; Lotus Petal; Brainstorm; Consider; Flow State
- Phase windows: resolving Doomsday or related library selection prompts.
- Runtime cues: prompt:choose cards; source:Doomsday
- Use when: the engine exposes finite card choices for a Doomsday pile.
- Avoid when: card text or library contents are incomplete; Card text check required for unfamiliar generated action labels.
- Instructions: Build the pile around the visible payoff and required draw access; include mana only when needed after resolution; prefer deterministic Oracle/Jace lines over fair-card piles unless the combo cannot finish safely.
- Pilot skill floor: expert.
- No-API allowed: no
- Light-model allowed: yes

### Policy: Deterministic Oracle Cast After Selected Line
- Priority: High
- Decision families: priority
- Cards: Thassa's Oracle
- Phase windows: own main phase or legal post-Doomsday cast window.
- Runtime cues: action:cast Thassa's Oracle
- Use when: Thassa's Oracle is the only legal action text containing cast Thassa's Oracle and the current plan has already selected Oracle as the payoff.
- Avoid when: any unresolved opposing spell or ability can change the library, hand, battlefield, or Oracle legality before resolution.
- Instructions: Execute the selected Oracle payoff without extra cantrip detours.
- Pilot skill floor: intermediate.
- No-API allowed: yes
- Light-model allowed: yes

### Policy: Jace Backup Commitment
- Priority: Medium
- Decision families: priority, mana
- Cards: Jace, Wielder of Mysteries; Dark Ritual; Lotus Petal; Lion's Eye Diamond; Force of Will
- Phase windows: own main phase after mana is available.
- Runtime cues: action:cast Jace, Wielder of Mysteries
- Use when: Jace, Wielder of Mysteries is legal and the pilot must choose between backup win and waiting.
- Avoid when: Thassa's Oracle line is available with lower exposure or Jace cannot be protected through visible pressure.
- Instructions: Treat Jace as a slower payoff requiring mana and stack protection; cast it when Oracle is inaccessible, a depleted library plan is ready, or a protected planeswalker win is safer than passing.
- Pilot skill floor: expert.
- No-API allowed: no
- Light-model allowed: yes

### Policy: Lion's Eye Diamond Commitment
- Priority: High
- Decision families: mana, priority
- Cards: Lion's Eye Diamond; Doomsday; Thassa's Oracle; Jace, Wielder of Mysteries; Brainstorm; Street Wraith; Edge of Autumn
- Phase windows: combo turn priority windows.
- Runtime cues: action:activate Lion's Eye Diamond
- Use when: activating Lion's Eye Diamond is legal and discarding the hand affects the current line.
- Avoid when: hand contains uncast payoff, protection, or required draw that has not been accounted for.
- Instructions: Activate only inside a mapped combo line where the mana color and hand discard are intentional; never spend it for generic speed if the remaining visible actions cannot finish.
- Pilot skill floor: expert.
- No-API allowed: no
- Light-model allowed: yes

### Policy: Ritual And Petal Mana Execution
- Priority: Medium
- Decision families: mana
- Cards: Dark Ritual; Lotus Petal
- Phase windows: main phases and combo-stack windows.
- Runtime cues: action:cast Dark Ritual; action:activate Lotus Petal
- Use when: the action text is the only visible way to produce mana required by an already selected same-turn spell.
- Avoid when: the spell to be paid for has not been selected or holding Lotus Petal changes protection color access.
- Instructions: Convert Ritual and Petal into mana for the chosen line; preserve Lotus Petal color flexibility until the exact cost is visible.
- Pilot skill floor: intermediate.
- No-API allowed: no
- Light-model allowed: yes

### Policy: Protection Spell Gate
- Priority: High
- Decision families: interaction, priority
- Cards: Force of Will; Daze; Thoughtseize; Force of Negation; Consign to Memory
- Phase windows: opponent stack actions, own setup turns, combo turn protection windows.
- Runtime cues: action:cast Force of Will; action:cast Daze; action:cast Thoughtseize; action:cast Force of Negation; action:cast Consign to Memory
- Use when: disruption can stop a visible spell, clear a known hand, or protect the combo turn.
- Avoid when: the target is low impact and spending protection leaves Doomsday or payoff exposed.
- Instructions: Spend free permission on threats that stop the combo, kill the payoff, win before next turn, or counter Doomsday; use Thoughtseize before commitment when life and mana allow.
- Pilot skill floor: advanced.
- No-API allowed: no
- Light-model allowed: yes

### Policy: Thoughtseize Target Selection
- Priority: Medium
- Decision families: interaction, selection
- Cards: Thoughtseize
- Phase windows: resolving Thoughtseize.
- Runtime cues: source:Thoughtseize; prompt:choose card
- Use when: opponent hand is revealed by a Thoughtseize decision prompt.
- Avoid when: the visible cards do not include a legal choice.
- Instructions: Take the card that most directly stops Doomsday, kills Thassa's Oracle or Jace, Wielder of Mysteries, wins before the combo turn, or removes the only protection window; respect exact legal choices only.
- Pilot skill floor: advanced.
- No-API allowed: no
- Light-model allowed: yes

### Policy: Cantrip Selection Discipline
- Priority: Medium
- Decision families: selection
- Cards: Brainstorm; Ponder; Consider; Flow State
- Phase windows: setup turns, end steps, post-Doomsday draw windows.
- Runtime cues: source:Brainstorm; source:Ponder; source:Consider; source:Flow State
- Use when: resolving a card-selection prompt from a named cantrip.
- Avoid when: the action is part of a preselected deterministic Doomsday pile and exact ordering is already prescribed by legal text.
- Instructions: Select for the missing resource in order: lethal payoff access, black mana, draw-after-Doomsday access, protection, then backup pressure; Card text check required for exact Flow State mode or timing if unknown.
- Pilot skill floor: advanced.
- No-API allowed: no
- Light-model allowed: yes

### Policy: Brainstorm With Shuffle
- Priority: Medium
- Decision families: selection, mana
- Cards: Brainstorm; Polluted Delta; Scalding Tarn; Misty Rainforest; Marsh Flats; Flooded Strand
- Phase windows: any Brainstorm cast or resolution window.
- Runtime cues: action:cast Brainstorm; source:Brainstorm
- Use when: Brainstorm is legal or resolving and a fetchland is visible or expected from current public state.
- Avoid when: Brainstorm is needed as the exact draw spell in a selected Doomsday line.
- Instructions: Use Brainstorm to hide or reset dead cards with a shuffle; avoid locking the top of library with redundant payoffs, excess lands, or unusable protection.
- Pilot skill floor: advanced.
- No-API allowed: no
- Light-model allowed: yes

### Policy: Wasteland Tempo Gate
- Priority: Low
- Decision families: mana, interaction
- Cards: Wasteland
- Phase windows: own main phases or opponent utility-land windows.
- Runtime cues: action:activate Wasteland
- Use when: Wasteland activation is legal and the target choice affects combo timing or opponent mana.
- Avoid when: sacrificing Wasteland prevents casting Doomsday, protection, Murktide Regent, Barrowgoyf, or sideboard interaction on schedule.
- Instructions: Use Wasteland only when mana denial changes the opponent's next decisive action or buys a full turn; preserve it as mana when combo assembly is resource constrained.
- Pilot skill floor: intermediate.
- No-API allowed: no
- Light-model allowed: yes

### Policy: Fair Threat Pivot
- Priority: Medium
- Decision families: priority, combat
- Cards: Murktide Regent; Tamiyo, Inquisitive Student; Barrowgoyf; Dauthi Voidwalker
- Phase windows: post-board or stalled pre-board main phases and combat.
- Runtime cues: action:cast Murktide Regent; action:cast Tamiyo, Inquisitive Student; action:cast Barrowgoyf; action:cast Dauthi Voidwalker
- Use when: the combo is delayed and a legal threat can pressure life total or force interaction.
- Avoid when: casting the threat consumes resources needed for a protected Doomsday turn.
- Instructions: Pivot to creatures when they shorten the clock, tax opposing removal, or stabilize combat; do not let fair pressure replace a ready protected combo.
- Pilot skill floor: advanced.
- No-API allowed: no
- Light-model allowed: yes

### Policy: Combat With Backup Threats
- Priority: Low
- Decision families: combat
- Cards: Murktide Regent; Tamiyo, Inquisitive Student; Barrowgoyf; Dauthi Voidwalker
- Phase windows: declare attackers, declare blockers, combat damage.
- Runtime cues: prompt:attackers; prompt:blockers
- Use when: legal combat choices involve listed creatures.
- Avoid when: combat risks a creature needed as the only clock against disruption-heavy opposition.
- Instructions: Attack when pressure advances a backup win without exposing the only stabilizer; block when survival or planeswalker pressure matters more than chip damage.
- Pilot skill floor: intermediate.
- No-API allowed: no
- Light-model allowed: yes

### Policy: Removal Target Gate
- Priority: Medium
- Decision families: interaction
- Cards: Fatal Push; Long Goodbye; Bitter Triumph
- Phase windows: opponent attacks, end steps, own main phase before combo.
- Runtime cues: action:cast Fatal Push; action:cast Long Goodbye; action:cast Bitter Triumph
- Use when: a removal spell is legal and target selection affects survival or combo access.
- Avoid when: target is not pressuring life, mana, graveyard, stack protection, or the payoff turn.
- Instructions: Remove creatures that create a lethal clock, deny combo resolution, or invalidate post-board fair pressure; preserve removal when the visible board is not forcing action.
- Pilot skill floor: intermediate.
- No-API allowed: no
- Light-model allowed: yes

### Policy: Street Wraith And Edge Draw Timing
- Priority: Medium
- Decision families: selection, priority
- Cards: Street Wraith; Edge of Autumn; Doomsday
- Phase windows: setup turns, post-Doomsday pile execution, emergency draw windows.
- Runtime cues: action:cycle Street Wraith; action:cycle Edge of Autumn
- Use when: cycling is legal and the card draw changes current combo access.
- Avoid when: life payment, land sacrifice, or draw timing breaks the planned pile or exposes lethal pressure.
- Instructions: Save free or low-mana draw for Doomsday piles unless immediate cycling finds a missing land, protection, or Doomsday before a forced deadline.
- Pilot skill floor: advanced.
- No-API allowed: no
- Light-model allowed: yes

### Policy: Sideboard Plan Selection
- Priority: High
- Decision families: sideboard
- Cards: Barrowgoyf; Bitter Triumph; Consign to Memory; Dauthi Voidwalker; Fatal Push; Force of Negation; Long Goodbye; Doomsday; Brainstorm; Ponder; Flow State; Force of Will; Thoughtseize; Murktide Regent
- Phase windows: between games.
- Runtime cues: prompt:sideboard
- Use when: choosing legal sideboard changes after a completed game.
- Avoid when: exact matchup identity, game number, or registered counts are unavailable.
- Instructions: Add only sideboard cards that answer the observed axis; preserve enough combo, mana, velocity, and protection that the deck remains a Doomsday deck after boarding.
- Pilot skill floor: advanced.
- No-API allowed: no
- Light-model allowed: yes

### Policy: Graveyard And Permanent Hate Pivot
- Priority: Medium
- Decision families: interaction, sideboard, combat
- Cards: Dauthi Voidwalker; Consign to Memory; Force of Negation; Barrowgoyf
- Phase windows: post-board setup, opponent graveyard or noncreature stack windows, combat.
- Runtime cues: action:cast Dauthi Voidwalker; action:cast Consign to Memory; action:cast Force of Negation; action:cast Barrowgoyf
- Use when: visible opponent plan relies on graveyard, stack-based noncreature action, or a fair battlefield race.
- Avoid when: casting hate delays a protected combo turn without changing the opponent's clock.
- Instructions: Use hate as bridge time toward Doomsday or as a coherent fair-pressure pivot; Card text check required for exact Consign to Memory and Barrowgoyf coverage if action text is unfamiliar.
- Pilot skill floor: advanced.
- No-API allowed: no
- Light-model allowed: yes
