# Strategy Specifications
## Deck Name And Archetype
Kethis Legends is a Historic combo-graveyard deck built around a legendary permanent density, graveyard access, and repeatable noncreature-spell loops rather than fair midrange sizing. The registered list is 61 main-deck cards and 14 sideboard cards, which passes the active Historic validation contract of at least 60 main cards and at most 15 sideboard cards, but the extra main-deck card means opening-hand quality and combo density should be evaluated more strictly than in a leaner 60-card build.

Format status is Historic, and runtime play must respect the engine's current legality, zones, costs, timing, and visible action list before applying this guide. The strategy tags are combo and graveyard; the duplicate tag string `combo,graveyard` should be treated as the same functional identity rather than a separate archetype signal. This is a hybrid list: the core package of `Kethis, the Hidden Hand`, `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, `Mox Amber`, and `Jace, the Perfected Mind` matches a known Kethis combo family, while the exact 61/14 registration, `Malevolent Rumble`, `Agatha's Soul Cauldron`, `Relic of Legends`, `Retraction Helix`, and the single `Jegantha, the Wellspring` create a customized build that should not be piloted as a generic stock list.

Primary role identity is engine-combo with selective resilience, not pure control. The pilot should develop mana, put legends and artifacts into play or graveyard, preserve access to `Kethis, the Hidden Hand`, and convert a legal combo window into a win through `Jace, the Perfected Mind` when the engine is assembled. The pilot should not assume the combo is deterministic until Forge exposes the exact legal actions for activating, casting, targeting, milling, and resolving each step.

Mana identity is demanding and tactical. The deck uses `Delighted Halfling`, `Mox Amber`, `Relic of Legends`, `Plaza of Heroes`, `Great Hall of the Citadel`, `Mana Confluence`, `Blooming Marsh`, `Breeding Pool`, `Botanical Sanctum`, `Boseiju, Who Endures`, and `Takenuma, Abandoned Mire` to support multicolor legendary sequencing, but not every source pays every cost in every context. The pilot must track whether a source can cast legendary spells, nonlegendary spells, activated abilities, sideboard interaction, or `Jace, the Perfected Mind`; `Mana Confluence` life loss also matters in races.

Legality and text-risk concerns are concentrated around exact Historic/Alchemy implementations and unusual cost or targeting windows. `A-Minsc & Boo, Timeless Heroes` uses an Arena-specific name, and `Agatha's Soul Cauldron`, `Malevolent Rumble`, `Great Hall of the Citadel`, `Retraction Helix`, `Tyvar, Jubilant Brawler`, and `Jace, the Perfected Mind` should be followed according to rules-engine output whenever card text, activation timing, or alternate costs matter. If the runtime exposes a legal action that conflicts with this guide's expectation, the legal action list wins.

Sideboard identity is compact and role-shifting. `Thoughtseize` and `Pact of Negation` support protected combo turns and disruption fights, `Fatal Push` handles creature pressure, `Force of Vigor` answers artifact or enchantment hate, `Urza's Ruinous Blast` provides a legendary-synergy reset button, `Bloodchief Ascension` offers a grind or punishment angle, and `A-Minsc & Boo, Timeless Heroes` gives a non-graveyard pressure plan. The sideboard has 14 cards, so the pilot should not assume a missing fifteenth option exists.

Opponent information status is unknown at registration time. No specific opposing archetype, known hand, metagame target, or play/draw assignment is supplied in this batch, so early decisions should use visible lands, revealed cards, companion information if any, public actions, and sideboard-stage context rather than naming hidden cards. Any opponent-only example in later policy must either stay in prose or be prefixed as opponent-only where policy syntax requires that distinction.

## Thesis
Kethis Legends assembles a legendary-permanent graveyard engine that turns cheap legends, artifact mana, and recursion into a legal combo turn ending through `Jace, the Perfected Mind`. The priority is to establish colored mana, land at least one engine legend, stock the graveyard, and preserve a window where `Kethis, the Hidden Hand`, `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, `Mox Amber`, and supporting recursion can be converted into repeated legal actions rather than scattered fair-value plays.

This deck wins by making the graveyard an extension of the hand, not by trading every card one-for-one until the opponent runs out of material. `Kethis, the Hidden Hand` is the main engine gate, `Rona, Herald of Invasion` and `Emry, Lurker of the Loch` provide repeatable access and velocity, `Mox Amber` enables explosive mana once legends are present, and `Jace, the Perfected Mind` is the primary payoff when the engine can legally generate enough milling or repeated casting pressure. The pilot should treat combo commitment as a real decision: if the opponent has open interaction, known graveyard hate, lethal pressure, or a visible answer on board, wait only when waiting improves redundancy or protection.

The deck is not trying to curve out as a normal creature deck, protect life total at all costs, or use `Jace, the Perfected Mind` as an early standalone threat unless the board state makes a partial mill or draw line necessary. `Delighted Halfling`, `Relic of Legends`, `Plaza of Heroes`, `Great Hall of the Citadel`, and `Mox Amber` are infrastructure first; spend them to accelerate legends and combo windows, not to simulate generic ramp. `Retraction Helix`, `Unearth`, `Takenuma, Abandoned Mire`, and `Boseiju, Who Endures` should be conserved when they are the only bridge through disruption, hate, or a missing engine piece.

Prioritize legal engine assembly over speculative value. Keep hands and lines that can produce mana plus a real legend, put useful cards into the graveyard, and expose either `Kethis, the Hidden Hand` or a path to it. Deprioritize hands with isolated payoffs, off-color mana, or interaction that does not advance the engine unless the matchup is visibly fast enough that survival is the first task.

## Role Package
- Threats: `Jace, the Perfected Mind`, `A-Minsc & Boo, Timeless Heroes`, and sometimes a transformed or enabled `Rona, Herald of Invasion` are the cards most likely to end games outside pure engine execution. Use `Jace, the Perfected Mind` as the main kill or card-flow payoff; use `A-Minsc & Boo, Timeless Heroes` only after sideboarding when a non-graveyard pressure plan is needed. Card text check required for exact transformed `Rona, Herald of Invasion` combat use; follow legal actions.

- Payoffs: `Jace, the Perfected Mind` is the primary combo payoff, while `Kethis, the Hidden Hand` is the payoff-enabler that makes graveyard legends matter. `Urza's Ruinous Blast` is a sideboard payoff for having a legendary-heavy board, but it is a reset tool rather than a combo piece. Do not fire payoff cards just because they are castable; ask whether the visible board, graveyard, and mana make the payoff decisive or stabilizing.

- Engines: `Kethis, the Hidden Hand`, `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, `Mox Amber`, `Agatha's Soul Cauldron`, `Relic of Legends`, and `Tyvar, Jubilant Brawler` form the engine suite. The strongest starts combine a mana creature or artifact with a cheap legend and graveyard access. `Agatha's Soul Cauldron` and `Tyvar, Jubilant Brawler` require runtime text and legal-action checks before assuming an activation line.

- Velocity: `Malevolent Rumble`, `Oath of Nissa`, `Emry, Lurker of the Loch`, `Rona, Herald of Invasion`, and `Jace, the Perfected Mind` help find pieces or stock zones. Use velocity early when it improves mana or engine density; delay it when holding it preserves a specific post-disruption recovery line.

- Interaction: Main-deck interaction is narrow and tactical: `Boseiju, Who Endures`, `Retraction Helix`, and some `Jace, the Perfected Mind` uses can affect opposing plans depending on legal targets and text. Sideboard interaction adds `Fatal Push`, `Thoughtseize`, `Force of Vigor`, `Urza's Ruinous Blast`, and `Pact of Negation`. Spend interaction to protect the combo window, answer hate, or survive lethal pressure, not to chase low-impact permanents.

- Protection: `Pact of Negation`, `Thoughtseize`, `Plaza of Heroes`, `Delighted Halfling`, and redundancy through `Unearth` and `Takenuma, Abandoned Mire` are the protection package. `Pact of Negation` protects a commitment turn; `Thoughtseize` clears known disruption before commitment; `Plaza of Heroes` and `Delighted Halfling` matter only according to their legal mana/protection actions.

- Recursion: `Unearth`, `Takenuma, Abandoned Mire`, `Emry, Lurker of the Loch`, and `Kethis, the Hidden Hand` recover or reuse core pieces. Prioritize recurring `Kethis, the Hidden Hand`, `Rona, Herald of Invasion`, or `Emry, Lurker of the Loch` when that reopens an engine line.

- Mana: `Delighted Halfling`, `Mox Amber`, `Relic of Legends`, `Mana Confluence`, `Plaza of Heroes`, `Great Hall of the Citadel`, `Blooming Marsh`, `Breeding Pool`, `Botanical Sanctum`, `Boseiju, Who Endures`, and `Takenuma, Abandoned Mire` are role-specific sources. Track which sources cast legends, nonlegendary spells, activated abilities, and sideboard cards before selecting a line.

- Sideboard modules: `Fatal Push` is creature survival, `Thoughtseize` is proactive disruption, `Pact of Negation` is combo-turn protection, `Force of Vigor` is hate removal, `Urza's Ruinous Blast` is legendary-board stabilization, `Bloodchief Ascension` is an alternate attrition pressure card, and `A-Minsc & Boo, Timeless Heroes` is a non-graveyard threat.

## Primary Win Conditions
- Engine-mill with `Kethis, the Hidden Hand` plus `Jace, the Perfected Mind` is the default kill. Set up by developing a legendary mana base, resolving `Rona, Herald of Invasion` or `Emry, Lurker of the Loch`, stocking the graveyard with `Malevolent Rumble`, `Oath of Nissa`, self-mill, or natural trading, and keeping enough legends available to fuel `Kethis, the Hidden Hand`. Execute only through legal engine actions: cast or reuse legends from the graveyard, convert `Mox Amber` and legendary sources into mana, and deploy `Jace, the Perfected Mind` when its visible mode or loyalty action advances a decisive mill line. Prioritize this path when the graveyard is stocked, `Kethis, the Hidden Hand` is active or recoverable, and the opponent cannot visibly break the chain with graveyard hate, removal, or stack interaction.

- `Rona, Herald of Invasion` plus `Retraction Helix` plus `Mox Amber` is the main loop-style execution shell when Forge exposes the required tap, bounce, cast, and mana actions. Set up by putting `Rona, Herald of Invasion` on board, keeping `Mox Amber` available on board or in a castable zone, and preserving `Retraction Helix` until the same-turn action sequence matters. Execute by targeting the legal creature with `Retraction Helix`, using the granted ability on `Mox Amber` or another legal nonland permanent only when that action text is exposed, recasting legendary objects to untap `Rona, Herald of Invasion`, and converting the loop into mana, graveyard access, or `Jace, the Perfected Mind`. Prioritize this line when a protected one-turn window is better than passing with exposed pieces.

- `Emry, Lurker of the Loch` plus `Mox Amber` and `Agatha's Soul Cauldron` is the artifact-recursion engine path when `Kethis, the Hidden Hand` is absent or delayed. Set up by milling artifacts and legends, resolving `Emry, Lurker of the Loch`, and retaining colored mana that can cast the next legend or payoff. Execute by following Forge legal actions for casting artifacts from the graveyard, activating `Agatha's Soul Cauldron`, and using `Mox Amber` only for colors it legally produces from visible legendary permanents. Prioritize this path against removal-heavy opponents when repeated recursion is safer than committing all graveyard fuel to one `Kethis, the Hidden Hand` turn.

- `Jace, the Perfected Mind` can win as an engine payoff or stabilize as a card-flow bridge. Set up by using mana creatures, `Mox Amber`, `Relic of Legends`, and legendary lands to reach the required mana while protecting the board enough that `Jace, the Perfected Mind` is not immediately irrelevant. Execute the mill plan when the opponent's library count, your available repeated actions, and legal loyalty or cast options make milling more valuable than drawing cards. Prioritize Jace as a standalone plan when the combo is partially assembled, the opponent is low on library, or card selection is required to find `Kethis, the Hidden Hand` or recursion.

## Secondary Win Conditions
- Legendary creature pressure is a real fallback when the opponent overcommits to graveyard hate or spends removal on engine pieces. Use `Kethis, the Hidden Hand`, `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, `Delighted Halfling`, and `Jegantha, the Wellspring` as attackers only when legal combat math supports it and the attack does not sacrifice a needed mana or combo role. Prioritize chip damage when the opponent is shields-down, your graveyard is contained, or a later `Jace, the Perfected Mind` activation will need fewer turns.

- Sideboard threat pressure can replace fragile graveyard dependence after boarding. `A-Minsc & Boo, Timeless Heroes` is the cleanest non-graveyard threat if it is included for the matchup; use it when the opponent is likely to hold graveyard hate or creature removal instead of planeswalker pressure. `Bloodchief Ascension` is an alternate attrition card, but card text check required for exact quest and damage conditions; follow runtime legal actions and do not assume it is active.

- Disruption-backed combo is the preferred post-board plan against interaction. Use `Thoughtseize` to clear a visible or likely stopping piece before committing, use `Pact of Negation` to protect the decisive stack exchange, and use `Force of Vigor` or `Boseiju, Who Endures` to answer hate permanents before starting. Prioritize disruption over velocity when the current hand already contains engine, payoff, and mana.

- Reset-and-rebuild lines matter against creature boards. `Fatal Push` buys time against early pressure, `Urza's Ruinous Blast` can reset nonlegendary boards when your legendary permanents survive, and `Plaza of Heroes` may protect a key legend if Forge exposes the legal action. Prioritize these lines when life total is the constraint and a delayed combo turn is still plausible.

## Emergency Lines
- Behind on life: stop spending `Mana Confluence` life loosely, use `Fatal Push` or `Urza's Ruinous Blast` if sideboarded and legal, and choose `Jace, the Perfected Mind` draw or defensive lines only when they find survival or an immediate kill. Do not attack with mana creatures if blocking, tapping for mana, or preserving combo infrastructure is required.

- Behind on board: stabilize before forcing a fragile engine. Use `Boseiju, Who Endures`, `Retraction Helix`, `Fatal Push`, or `Urza's Ruinous Blast` according to legal targets, then rebuild with `Unearth`, `Takenuma, Abandoned Mire`, `Emry, Lurker of the Loch`, and `Kethis, the Hidden Hand`.

- Behind on cards: turn graveyard density into virtual hand size instead of chasing fair trades. Prioritize `Malevolent Rumble`, `Oath of Nissa`, `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, and `Jace, the Perfected Mind` modes that increase access to engine pieces.

- Behind on mana: protect `Delighted Halfling`, sequence `Mox Amber` after a legend when possible, and use `Relic of Legends`, `Great Hall of the Citadel`, `Plaza of Heroes`, and `Mana Confluence` according to exact legal color output. Do not keep spending channel lands as spells if land count is the bottleneck.

- Engine removed: recur the most central missing piece first. `Unearth` and `Takenuma, Abandoned Mire` should usually recover `Kethis, the Hidden Hand`, `Rona, Herald of Invasion`, or `Emry, Lurker of the Loch` rather than a low-impact body, unless the visible legal action says a different card immediately wins or prevents losing.

- Graveyard shut off: answer the hate permanent before committing more resources to the graveyard, or pivot to board pressure and sideboard threats. Use `Boseiju, Who Endures`, `Force of Vigor`, `Thoughtseize`, or `Urza's Ruinous Blast` only when their legal actions line up with the hate or the survival need.

- Win condition removed: if `Jace, the Perfected Mind` is gone or inaccessible, preserve `Kethis, the Hidden Hand` engines for recursion, pressure with legends, and lean on `A-Minsc & Boo, Timeless Heroes` or `Bloodchief Ascension` after sideboarding. Do not concede lines unless Forge reports no legal path or the game is over.

## Resource Model
- Life total is a combo timer, not a free bank. Spend `Mana Confluence` life aggressively when it converts into `Kethis, the Hidden Hand`, `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, or a protected same-turn combo window, but stop bleeding for speculative setup when the opponent has visible pressure or burn-like reach.

- Hand size is best measured by engine access, not raw cards. A hand with `Mox Amber`, a legend, and either `Kethis, the Hidden Hand`, `Emry, Lurker of the Loch`, `Rona, Herald of Invasion`, `Malevolent Rumble`, or `Oath of Nissa` is usually richer than a larger hand without a way to convert graveyard or board resources.

- Mana is the main bottleneck before the engine starts and the main payoff after it starts. Prioritize permanents that create repeated mana, especially `Delighted Halfling`, `Mox Amber`, `Relic of Legends`, legendary creatures, and lands that cast legends; treat one-shot color access as precious when it enables the first `Kethis, the Hidden Hand` or `Jace, the Perfected Mind`.

- Board presence is infrastructure first and pressure second. Keep `Delighted Halfling`, `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, and `Kethis, the Hidden Hand` untapped when their mana, loot, recursion, or `Retraction Helix` roles matter more than combat damage.

- Graveyard cards are virtual hand and combo fuel. Mill, loot, and selection from `Malevolent Rumble`, `Rona, Herald of Invasion`, `Oath of Nissa`, `Emry, Lurker of the Loch`, `Takenuma, Abandoned Mire`, and `Jace, the Perfected Mind` should favor putting legends and artifacts where `Kethis, the Hidden Hand` and `Emry, Lurker of the Loch` can reuse them, while preserving enough legendary cards to pay Kethis activation costs.

- Exile is a cost zone and sometimes an engine zone. Exiling legends to `Kethis, the Hidden Hand` should buy a decisive cast sequence, not merely a small discount; exiling with `Agatha's Soul Cauldron` is conditional on visible legal actions and should not consume a card whose graveyard role is stronger.

- Lands are both colored sources and spells. Treat `Boseiju, Who Endures` and `Takenuma, Abandoned Mire` as lands until mana is stable, then consider channel lines only when the legal target or recursion target materially changes the turn.

- Sacrifice fodder is not a normal resource for this list. Do not invent sacrifice lines; only sacrifice or discard permanents if Forge exposes a legal cost or effect from the current card text.

- Tempo is gained by compacting setup into one protected turn. Use early turns to assemble legend plus `Mox Amber` plus graveyard density, then spend the decisive turn on `Kethis, the Hidden Hand`, `Retraction Helix`, `Emry, Lurker of the Loch`, or `Jace, the Perfected Mind` rather than fair exchanges.

- Information changes commitment timing. Known removal, counterplay, graveyard hate, or artifact hate should push toward `Thoughtseize`, `Pact of Negation`, `Boseiju, Who Endures`, `Force of Vigor`, or a non-graveyard sideboard threat before committing.

- Sideboard bullets trade speed for resilience. `Fatal Push` buys life and time, `Thoughtseize` clears interaction, `Pact of Negation` protects the kill turn, `Force of Vigor` and `Boseiju, Who Endures` answer hate, `Urza's Ruinous Blast` resets creature boards, and `A-Minsc & Boo, Timeless Heroes` or `Bloodchief Ascension` can diversify threats when graveyard reliance is punished.

## Mana Guide
- Keep hands that cast an early enabler and have a plausible second color. Strong starts usually include two lands or one land plus `Mox Amber` plus a castable legend, with access to green for `Delighted Halfling`, `Malevolent Rumble`, `Oath of Nissa`, or `Kethis, the Hidden Hand` setup.

- Mulligan hands that cannot produce meaningful mana by turn two. A hand with only utility lands, no castable legend for `Mox Amber`, or no green/blue/black path to engine cards should be treated as nonfunctional unless the visible matchup context makes a slower disruptive plan necessary.

- Sequence legends before `Mox Amber` when the extra mana matters. `Mox Amber` without a visible legendary creature or planeswalker is often just stored potential; cast `Delighted Halfling`, `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, `Kethis, the Hidden Hand`, or `Jace, the Perfected Mind` first when that makes Amber produce a needed color.

- Use `Delighted Halfling` as protected legend mana first. Its colored mana should prioritize `Kethis, the Hidden Hand`, `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, `Jace, the Perfected Mind`, `Tyvar, Jubilant Brawler`, and `Jegantha, the Wellspring` when legal; do not spend it on lower-impact actions if it strands a key legend.

- Preserve `Mana Confluence` for colors that no other source covers. Pay life to fix decisive casts, but use `Blooming Marsh`, `Botanical Sanctum`, `Breeding Pool`, `Plaza of Heroes`, `Great Hall of the Citadel`, `Mox Amber`, or `Delighted Halfling` first when they legally produce the same color without life loss.

- Treat `Plaza of Heroes` and `Great Hall of the Citadel` as legend-centric lands. Use them to cast or protect legendary spells and permanents when Forge exposes those actions; verify exact legal output from the engine before assuming they cast nonlegendary cards such as `Retraction Helix`, `Unearth`, `Malevolent Rumble`, `Oath of Nissa`, `Agatha's Soul Cauldron`, or sideboard interaction.

- Delay channel-land use until land count is safe. `Boseiju, Who Endures` and `Takenuma, Abandoned Mire` are usually mana sources in opening hands; channel them only when the target is legal, the mana base remains functional afterward, and the effect either answers hate, recovers a key legend, or prevents losing.

- Play land before selection when the current turn needs exact mana. If casting `Malevolent Rumble`, `Oath of Nissa`, `Rona, Herald of Invasion`, or `Jace, the Perfected Mind` cannot change this turn's land choice, make the land drop first to unlock actions and avoid missing a same-turn engine line.

- Wait on land drops when selection can reveal a better utility choice. If a draw, loot, mill, or selection action may reveal `Boseiju, Who Endures`, `Takenuma, Abandoned Mire`, `Plaza of Heroes`, or the missing color source and no immediate mana is needed first, resolve selection before playing a land.

- During combo turns, count colored mana after every legal action. `Rona, Herald of Invasion` untaps, `Mox Amber` color availability, `Kethis, the Hidden Hand` discounts, and recast legends can change the next payment; choose exact mana sources from Forge output rather than assuming a floating plan remains legal.

## Mulligan Guide
- Strong keep: keep two lands plus `Delighted Halfling` or `Mox Amber` plus a castable legend, especially when the hand also has `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, `Kethis, the Hidden Hand`, `Malevolent Rumble`, or `Oath of Nissa`. This hand develops mana, stocks the graveyard, and threatens a turn-three engine without needing perfect draw steps.

- Strong keep: keep one land plus `Delighted Halfling`, `Mox Amber`, and multiple cheap legends only when the land casts the first creature and the visible matchup does not punish a failed mana creature. Prefer this on the play against slower decks; be stricter on the draw against removal-heavy or pressure-heavy starts.

- Medium keep: keep two or three lands plus `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, and either `Malevolent Rumble`, `Oath of Nissa`, `Unearth`, or `Agatha's Soul Cauldron`. The hand is slower than a `Delighted Halfling` start but has enough selection and recursion to assemble `Kethis, the Hidden Hand` or `Jace, the Perfected Mind`.

- Risky keep: keep `Mox Amber` hands without `Delighted Halfling` only if a cheap legend is already castable and the second mana source is credible. `Mox Amber` plus uncastable legends is not acceleration; it is a mulligan unless the hand has strong selection and enough lands.

- Automatic ship: ship zero-land, one-land-without-castable-action, and all-spell hands that cannot cast `Delighted Halfling`, `Oath of Nissa`, `Malevolent Rumble`, `Rona, Herald of Invasion`, or `Emry, Lurker of the Loch` by turn two. This deck cannot assume the engine will rescue nonfunctional mana.

- Automatic ship: ship hands with only payoff density and no setup, such as multiple `Jace, the Perfected Mind`, `Kethis, the Hidden Hand`, `Retraction Helix`, or `Agatha's Soul Cauldron` but no early creature, selection, or graveyard access. The first engine piece must be enabled before payoff cards matter.

- Matchup-dependent keep: keep sideboard hands with `Thoughtseize` plus mana and any engine card against visible interaction or combo, but do not keep a discard-only hand that lacks `Delighted Halfling`, `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, `Kethis, the Hidden Hand`, `Malevolent Rumble`, or `Oath of Nissa`. Against creature pressure, `Fatal Push` can justify a slower keep only when the rest of the hand still advances the engine.

- Play/draw adjustment: on the play, value explosive mana starts with `Delighted Halfling`, `Mox Amber`, and a cheap legend because they can force the opponent to react. On the draw, value redundancy, `Thoughtseize`, `Fatal Push`, `Unearth`, or extra selection more highly because the first enabler is more likely to die.

- Trap hand: do not keep `Retraction Helix` plus no reliable creature to target, even with `Mox Amber`. `Retraction Helix` is a payoff/action bridge after a permanent sticks, not a standalone plan.

- Trap hand: do not overkeep lands plus `Jace, the Perfected Mind` as a fair mill plan unless the matchup is slow and the hand has disruption or acceleration. `Jace, the Perfected Mind` is strongest as a combo payoff or stabilized backup, not as the only early action.

## Turn Arc
- Turn 1 priority: cast `Delighted Halfling` when legal because it accelerates and fixes the critical legend turn. If `Delighted Halfling` is absent, cast `Oath of Nissa` or `Mox Amber` only when the action improves turn-two development; otherwise lead with the land that preserves the most colors for `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, or `Malevolent Rumble`.

- Turn 1 deviation: cast `Thoughtseize` after sideboarding when the matchup is interaction-heavy or faster than the combo. Take the visible card that stops the first engine commitment or kills the only enabler; do not use discard merely to confirm a hand when a mana creature or selection spell is more urgent.

- Turn 2 priority: deploy `Rona, Herald of Invasion` or `Emry, Lurker of the Loch` before slower setup if the mana allows it. `Rona, Herald of Invasion` turns later legends into filtering, while `Emry, Lurker of the Loch` makes `Mox Amber` and graveyard artifacts matter.

- Turn 2 deviation: cast `Malevolent Rumble` or `Oath of Nissa` when the hand is missing `Kethis, the Hidden Hand`, a second land, a cheap legend, or an artifact to pair with `Emry, Lurker of the Loch`. Choose selection lines that make turn three stronger rather than filling the graveyard with no follow-up.

- Turn 3 priority: commit `Kethis, the Hidden Hand` when it is protected by mana, redundancy, or immediate value, especially with legends already in the graveyard. If `Kethis, the Hidden Hand` would enter and pass with no activation pressure, consider `Jace, the Perfected Mind`, `Tyvar, Jubilant Brawler`, `Agatha's Soul Cauldron`, `Relic of Legends`, or more selection instead, based on legal actions.

- Turn 3 combo posture: set up `Retraction Helix` only when a target creature is legal and the bounce line has a visible reason, such as `Mox Amber` recast loops, `Rona, Herald of Invasion` filtering, `Emry, Lurker of the Loch` artifact recursion, or a same-turn payoff. Do not expose `Retraction Helix` into open interaction without a payoff or necessity.

- Turns 4-5 priority: attempt the decisive engine turn when mana, graveyard count, and legal actions line up. Use `Kethis, the Hidden Hand` to turn graveyard legends into resources, use `Emry, Lurker of the Loch` to reuse artifacts when legal, and use `Jace, the Perfected Mind` as the payoff when the engine can sustain the line.

- Turns 4-5 deviation: answer hate or pressure before committing if Forge shows legal `Boseiju, Who Endures`, `Fatal Push`, `Force of Vigor`, `Urza's Ruinous Blast`, or `Thoughtseize` actions and the visible board would otherwise stop the combo or end the game. Stabilizing for one turn is correct when the next turn is materially more likely to win.

- Late-game priority: convert every graveyard, land, and legend into a concrete legal action. `Takenuma, Abandoned Mire` can recover a key card when legal, `Jegantha, the Wellspring` can become a mana body or threat when the game slows, and extra `Kethis, the Hidden Hand` copies can pay activation costs or restart the chain.

- Late-game caution: do not assume inevitability through graveyard hate, stack interaction, or lethal pressure. When the visible opponent clock is short, favor the line that either wins this turn, removes the hate piece, protects the combo with `Pact of Negation`, or creates a blocker/removal sequence that survives to the next engine window.

## Card Roles
- `Delighted Halfling`: prioritize `Delighted Halfling` as the cleanest turn-one setup card because it accelerates into `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, `Kethis, the Hidden Hand`, `Tyvar, Jubilant Brawler`, `Jace, the Perfected Mind`, and `Jegantha, the Wellspring`. Use it to fix legendary spells before spending pain mana from `Mana Confluence`, but do not expose it to combat trades unless blocking preserves life against a lethal clock or buys the turn needed to combo. The common mistake is keeping a hand that needs `Delighted Halfling` to survive but has no backup engine, selection, or second mana path.

- `Rona, Herald of Invasion`: treat `Rona, Herald of Invasion` as both a cheap legend and the main filtering engine. Cast it early when the hand contains legends to trigger it, especially `Mox Amber`, `Kethis, the Hidden Hand`, `Emry, Lurker of the Loch`, `Jace, the Perfected Mind`, `Tyvar, Jubilant Brawler`, or another `Rona, Herald of Invasion`. During combo turns, use Rona triggers to turn redundant lands, extra copies, and dead interaction into fresh looks, but respect the rules engine's visible stack and discard choices rather than assuming every loot is free. Do not transform or spend mana on non-core text unless Forge exposes a legal action that is clearly better than advancing the combo; Card text check required for backside tactical assumptions.

- `Emry, Lurker of the Loch`: cast `Emry, Lurker of the Loch` when the graveyard and artifact count make it more than a fragile body. Its best jobs are milling toward legends, recurring `Mox Amber`, reusing `Agatha's Soul Cauldron` or `Relic of Legends` if legal, and giving `Retraction Helix` a creature that can generate repeated artifact actions. If the opponent is showing cheap removal, prefer sequencing that gets immediate mill or artifact value before relying on Emry to untap. Do not cast Emry into graveyard hate expecting normal recursion if public information says the graveyard line is currently constrained.

- `Kethis, the Hidden Hand`: commit `Kethis, the Hidden Hand` when it can immediately reduce costs, enable graveyard legendary casts, or force a decisive response. Kethis is the deck's main graveyard-to-battlefield bridge, so prioritize it when the graveyard contains legends and the hand or battlefield can convert those casts into `Rona, Herald of Invasion` triggers, `Mox Amber` mana, or `Jace, the Perfected Mind` access. Use extra legendary cards as fuel only when the current line needs them; do not exile future recovery pieces casually. The common mistake is casting Kethis as a vanilla creature into open removal with no immediate activation, no backup copy, and no graveyard pressure.

- `Mox Amber`: treat `Mox Amber` as explosive mana only after a legend is on the battlefield. With `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, `Kethis, the Hidden Hand`, `Tyvar, Jubilant Brawler`, `Jace, the Perfected Mind`, or `Jegantha, the Wellspring` visible, `Mox Amber` can turn a normal turn into a chain turn. With `Retraction Helix`, repeated `Mox Amber` casts can become the physical object that is bounced and replayed if Forge presents those legal actions. Do not keep or sequence as if `Mox Amber` makes mana while the battlefield has no qualifying legend.

- `Agatha's Soul Cauldron`: use `Agatha's Soul Cauldron` as a resilient engine and hate-adjacent artifact when its legal activated or static effects matter. It can interact with graveyards and can matter with creature abilities, but Card text check required before assuming a specific ability-copy or counter interaction. In practice, cast it when it improves a disrupted game, gives `Emry, Lurker of the Loch` another artifact angle, pressures opposing graveyard plans, or turns dead creatures into future resources. Do not spend a combo turn on it when the visible legal actions already produce a Kethis/Rona/Mox/Jace line.

- `Relic of Legends`: use `Relic of Legends` as the one main-deck stabilizing mana engine when the hand is legend-heavy or `Mox Amber` alone is unreliable. It helps convert legendary creatures into mana, supports longer turns, and can let the deck operate through removal that kills `Delighted Halfling`. Because it is a singleton, do not build a plan that requires drawing it; treat it as a bonus bridge when Forge exposes it. With `Emry, Lurker of the Loch`, consider recursion only if the artifact and mana timing are legal and better than advancing the main Kethis plan.

- `Retraction Helix`: hold `Retraction Helix` until a creature target is legal and the bounce ability has a concrete purpose. The primary uses are enabling repeated `Mox Amber` loops, converting `Rona, Herald of Invasion` or `Emry, Lurker of the Loch` into a combo action, answering a visible permanent temporarily, or clearing a blocker/hate piece for the decisive turn. Do not fire it merely because it is castable; the spell needs a creature that can tap, an object worth bouncing, and enough mana or follow-up actions to capitalize.

- `Unearth`: use `Unearth` to restore cheap engine creatures after removal, mill, or combat, especially `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, `Delighted Halfling`, and sometimes `Kethis, the Hidden Hand` only if the rules engine confirms legality. It is strongest when it creates immediate mana, filtering, or combo material rather than simply rebuilding a board into another sweeper or exile effect. Cycling or alternate text should be chosen only when Forge shows the legal action and the graveyard has no meaningful creature target; Card text check required for exact mode assumptions.

- `Malevolent Rumble`: cast `Malevolent Rumble` when the hand needs selection, graveyard density, or a bridge into lands and permanents. It should find or fuel `Kethis, the Hidden Hand`, `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, `Mox Amber`, `Agatha's Soul Cauldron`, or missing mana, depending on legal candidates. Card text check required for exact token and selection rules, so follow Forge's candidate list and choose the card that completes the next two-turn plan. Do not choose a flashy payoff if the visible hand still lacks castable setup or a third mana source.

- `Oath of Nissa`: use `Oath of Nissa` as early smoothing and later legend/planeswalker access, not as graveyard fuel. It helps find lands, creatures, or planeswalkers when the opener is missing a key piece, and it can support awkward mana for `Jace, the Perfected Mind` or `Tyvar, Jubilant Brawler` if its text applies; Card text check required for exact mana permission. Choose the candidate that fixes the bottleneck: mana first, early legend second, payoff third. Do not cast it before playing the land if holding it might reveal which land should be played this turn.

- `Tyvar, Jubilant Brawler`: use `Tyvar, Jubilant Brawler` as a singleton acceleration and recursion engine, especially with creatures whose tap abilities matter. It can make `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, or a `Retraction Helix` target more explosive if Forge presents legal activations. Card text check required for exact loyalty modes, but tactically prefer Tyvar when it gives immediate creature value or recovers a key engine piece. Do not tap out for Tyvar when the immediate issue is graveyard hate, lethal pressure, or needing `Kethis, the Hidden Hand` this turn.

- `Jace, the Perfected Mind`: treat `Jace, the Perfected Mind` as the main deterministic payoff and a backup fair plan. In combo turns, use Jace when the legal action mills the opponent or self in a way that advances the win or reloads the graveyard, but choose targets from visible action text and do not assume hidden library contents. In fair games, Jace can pressure slow opponents, shrink a relevant creature if legal, or dig through a large graveyard state; Card text check required for exact loyalty mode text. The mistake is deploying Jace as the only plan into pressure when the board needs a blocker, removal, discard, or engine rebuild.

- `Jegantha, the Wellspring`: use `Jegantha, the Wellspring` as a late stabilizer, mana source, legend, and companion-like pressure card only when the game slows enough to spend the mana. It can turn on `Mox Amber`, trigger `Rona, Herald of Invasion`, and make `Relic of Legends` or legendary mana patterns stronger, but it is not the first engine piece unless the hand is otherwise empty. Do not choose Jegantha lines over a live Kethis combo unless the visible board demands a body or mana bridge.

- Legendary lands: use `Boseiju, Who Endures` and `Takenuma, Abandoned Mire` as spells only when their channel or special legal actions answer a real problem or recover a real engine card. `Boseiju, Who Endures` is precious against artifacts, enchantments, and nonbasic lands that stop the combo; `Takenuma, Abandoned Mire` is precious after removal or self-mill. Because both are lands and legends, do not discard or channel them automatically when land drops, Kethis fuel, or mana colors matter more.

- Mana lands: sequence `Plaza of Heroes`, `Great Hall of the Citadel`, `Mana Confluence`, `Blooming Marsh`, `Breeding Pool`, and `Botanical Sanctum` to cast the first engine creature while preserving colors for turn two and turn three. `Mana Confluence` fixes everything but costs life, so use painless lands first when pressure is high. `Plaza of Heroes` and `Great Hall of the Citadel` are strongest with legendary spells and legendary-heavy hands, but do not assume they cast every nonlegend spell unless Forge confirms legal mana payment. Lands are part of the combo plan because every missed color can turn a winning hand into a pass.

## Interaction Priorities
- Priority: protect the active combo turn before answering ordinary board clutter. Spend `Pact of Negation`, `Thoughtseize`, `Boseiju, Who Endures`, `Retraction Helix`, or `Force of Vigor` on a card that stops `Kethis, the Hidden Hand`, `Rona, Herald of Invasion`, `Mox Amber`, `Emry, Lurker of the Loch`, or `Jace, the Perfected Mind` from resolving or functioning; do not spend them just to make the board look cleaner.

- Discard: use `Thoughtseize` first on visible hate, permission, instant-speed removal, or a faster combo payoff, in that order. Against control, take the card that can answer the committed turn rather than a generic draw spell. Against aggro, take the highest-pressure card only if life total or blockers cannot absorb it; otherwise take the disruption that would stop stabilization. Against combo, take the card that creates the earliest deterministic kill or protects it.

- Counter: use `Pact of Negation` as a commitment shield, not as normal tempo interaction. Counter the spell that would break the chosen combo turn, remove the only engine creature, exile the graveyard, or produce lethal before the next upkeep payment matters. Do not counter low-impact setup when waiting preserves `Pact of Negation` for the turn where `Jace, the Perfected Mind` or the Kethis loop is actually winning.

- Remove: use `Fatal Push` postboard on hate creatures, must-kill combo creatures, and attackers that change a survival clock from safe to unsafe. Do not spend `Fatal Push` on a creature that is only dealing small damage if the hand needs to answer a creature preventing `Retraction Helix`, `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, or graveyard access from mattering.

- Bounce: use `Retraction Helix` as temporary interaction only when the bounce unlocks a same-turn engine line, removes a blocker for a planeswalker or lethal attack, or clears a visible hate permanent for a decisive turn. Prefer saving it for `Mox Amber` loop execution when the board already contains a tap-ready creature; bouncing an opponent permanent without follow-up usually gives them the card back and costs the deck its cleanest combo enabler.

- Exile and permanent answers: use `Boseiju, Who Endures`, `Force of Vigor`, and `Urza's Ruinous Blast` on permanents that actually block the graveyard, artifacts, legends, activated abilities, or combat survival. `Urza's Ruinous Blast` should be chosen only when Forge shows the legal action and the current legendary/nonlegendary battlefield split favors this deck; Card text check required for exact exile pattern. `Agatha's Soul Cauldron` may interact with graveyards or abilities when legal, but Card text check required, so choose exile targets only from Forge-visible candidates that deny an opponent resource or add a relevant ability to this deck.

- Bait: present `Delighted Halfling`, `Oath of Nissa`, `Malevolent Rumble`, or a nonessential `Emry, Lurker of the Loch` before exposing `Kethis, the Hidden Hand` when the opponent is representing removal or permission. Do not bait with the only copy of a required engine piece unless `Unearth`, `Takenuma, Abandoned Mire`, `Tyvar, Jubilant Brawler`, or graveyard recursion makes the exchange recoverable.

- Ignore: ignore creatures, artifacts, enchantments, and planeswalkers that do not shorten the clock, disrupt the graveyard, stop activated abilities, tax spells, or answer the combo. Kethis Legends wins many games by making a narrow window decisive, so spending interaction on medium pressure can be worse than accepting damage and preserving the answer for hate.

## Combat And Trading Rules
- Preserve engine bodies before chip damage. `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, `Kethis, the Hidden Hand`, `Delighted Halfling`, and a `Retraction Helix` target are usually mana, selection, or combo resources first and attackers second; attack only when the creature is not needed to tap, block, crew a mana plan, survive removal, or enable `Mox Amber` this turn cycle.

- Block to buy the combo turn, not to win combat attrition. Trade `Delighted Halfling` only when the mana is no longer needed, lethal pressure is approaching, or `Unearth`/`Tyvar, Jubilant Brawler` can recover the role. Trade `Rona, Herald of Invasion` or `Emry, Lurker of the Loch` only when dying without the block is likely or the graveyard/hand already contains redundancy. Avoid trading `Kethis, the Hidden Hand` unless the block prevents lethal or Forge shows a recoverable line.

- Use life total as a resource until the next attack is dangerous. Above roughly 12 life against fair pressure, prefer engine development over defensive trades. From roughly 8 to 11, preserve blockers and reduce `Mana Confluence` pain when possible. At 7 or less, treat each unblocked creature as a potential lethal setup and prioritize `Fatal Push`, bounce, chump blocks, or a same-turn combo attempt over slow value.

- Attack planeswalkers only when the attack prevents a visible ultimate, removal mode, or card-flow engine that will beat the combo. Attacking life totals with small legends is secondary unless `Jace, the Perfected Mind`, `A-Minsc & Boo, Timeless Heroes`, or combat damage is already the active backup win plan.

- Against aggro, block earlier and spend interaction on clock compression. `Delighted Halfling` may become expendable after it has cast the first engine spell, but `Rona, Herald of Invasion` and `Emry, Lurker of the Loch` should survive if they create a realistic next-turn combo or filtering line. Do not pay extra `Mana Confluence` life for marginal sequencing when a painless legal mana payment still advances the turn.

- Against control, do not attack engine creatures into obvious removal or sweep patterns merely for damage. Keep legends available to turn on `Mox Amber`, pressure with resilient resources, and force the opponent to answer `Kethis, the Hidden Hand`, `Jace, the Perfected Mind`, or `A-Minsc & Boo, Timeless Heroes` at awkward times.

- Against creature combo, preserve blockers that interrupt attacks but prioritize racing through the graveyard engine. A chump block is correct if it creates one more draw step or untap for `Kethis, the Hidden Hand`; a trade is correct if it removes the opponent's required creature and does not strand this deck without mana or a tap target.

- Protect `Jace, the Perfected Mind` only when Jace is actively winning, drawing into the combo, or shrinking a lethal attacker through a legal mode. Do not throw away engine creatures to defend a low-impact Jace activation if those creatures would produce a better Kethis turn.

## Selection And Tutor Rules
- Use selection to assemble a legal engine turn, not to maximize abstract card quality. Prefer lines that put `Kethis, the Hidden Hand`, `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, `Mox Amber`, and a tap-ready creature into hand, battlefield, or graveyard in combinations Forge can actually execute.

- Cast `Oath of Nissa` early when mana or an engine permanent is missing. Take the card that fixes the next bottleneck: land when a land drop is needed, `Kethis, the Hidden Hand` when the graveyard is stocked, `Rona, Herald of Invasion` or `Emry, Lurker of the Loch` when no engine body is present, and `Jace, the Perfected Mind` when the game needs a noncombat payoff or card-flow pivot.

- Use `Malevolent Rumble` as setup when the deck can benefit from both the chosen permanent and graveyard fill. Prioritize missing engine permanents over extra copies, but value legends in the graveyard when `Kethis, the Hidden Hand` is already present or easily recoverable. Card text check required for exact token and selection wording, so follow Forge candidates rather than assuming every revealed card is selectable.

- Sequence `Emry, Lurker of the Loch` before graveyard payoffs when artifact recursion or self-mill matters more than immediate hand selection. `Emry, Lurker of the Loch` is strongest when it can mill toward legends, reuse `Mox Amber`, or set up a future `Retraction Helix` loop; avoid exposing it into removal if another setup spell can bait interaction first.

- Use `Rona, Herald of Invasion` filtering to convert redundant legends and dead lands into engine density. Discard extra copies that are better as `Kethis, the Hidden Hand` fuel, but keep the only copy of a required battlefield piece unless `Unearth`, `Takenuma, Abandoned Mire`, or `Tyvar, Jubilant Brawler` gives a visible recovery path.

- Treat `Takenuma, Abandoned Mire` as selective recursion when the game needs a specific legend back. Channel or activate it only when the returned card changes the next turn cycle, such as recovering `Kethis, the Hidden Hand`, `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, `Jace, the Perfected Mind`, or `Tyvar, Jubilant Brawler`; otherwise preserve it as a land if mana is constrained.

- Use `Jace, the Perfected Mind` selection modes according to role. If the combo is close, prefer card access or self-mill modes that find missing pieces or stock the graveyard. If the opponent is low-library or Jace is the active win condition, choose the legal mill line only after checking board pressure and whether tapping out loses to visible attacks or stack interaction.

- Use `Agatha's Soul Cauldron` only through Forge-visible legal targets. Card text check required for exact ability and counter behavior; select graveyard cards that deny the opponent a real resource or grant this deck an ability relevant to the current board, not cards that merely look powerful in isolation.

- Make land drops after selection when possible if the selection spell can change the correct land. Hold a land briefly before `Oath of Nissa`, `Malevolent Rumble`, or `Rona, Herald of Invasion` filtering when legal and low-risk; play the land first when mana is needed to cast the selector or when missing the land drop would block all useful actions.

## Priority And Stack Rules
- Pass priority through low-impact windows unless a visible action changes the combo turn, survival math, or a key permanent. Kethis Legends should not spend `Retraction Helix`, `Boseiju, Who Endures`, `Fatal Push`, `Pact of Negation`, or `Force of Vigor` just because Forge offers an instant-speed action.

- Commit to the combo only when the visible position supports it. Before activating `Kethis, the Hidden Hand`, casting `Retraction Helix`, or relying on `Mox Amber` loops, check for available mana, a tap-ready creature, enough legendary graveyard fuel, a payoff such as `Jace, the Perfected Mind`, and whether waiting exposes the deck to lethal or graveyard disruption.

- Use `Retraction Helix` at priority as an engine enabler first. Target the creature Forge shows can legally tap and keep bouncing `Mox Amber` only when the loop is already selected and mana/action text confirms the next step. Use it defensively only to remove a hate permanent, attacker, blocker, or stack-relevant permanent for the current decisive turn.

- Activate `Emry, Lurker of the Loch` when the artifact cast advances the turn. Recasting `Mox Amber` is high priority during a loop or mana bottleneck, while replaying an artifact for minor value can wait if holding priority would reveal less or preserve a blocker.

- Spend `Pact of Negation` only on spells that stop a chosen win turn, remove the only engine piece, exile the graveyard, or create lethal before the next upkeep. Do not counter ordinary removal if another `Kethis, the Hidden Hand`, `Unearth`, `Tyvar, Jubilant Brawler`, or graveyard line is visibly available and the Pact payment would be dangerous.

- Use `Boseiju, Who Endures`, `Force of Vigor`, and `Fatal Push` in response to hate or lethal pressure, not as generic tempo. Answer permanents that stop graveyard use, artifacts, legends, activated abilities, or survival; otherwise preserve interaction for the turn where it unlocks a kill or prevents a loss.

- Choose optional payments and triggered actions only when they improve the current plan. Decline optional lines that consume mana needed for `Pact of Negation`, `Kethis, the Hidden Hand`, `Mox Amber` recasts, `Jace, the Perfected Mind`, or interaction. Card text check required for any ambiguous optional trigger or payment not fully described by Forge action text.

- Let opposing spells resolve when they do not affect the clock, graveyard, engine permanents, stack protection, or next-turn kill. Holding interaction is usually stronger than trading resources for a harmless setup spell, especially when the deck needs a protected commitment turn rather than a fair exchange.

- Use graveyard timing carefully. Exile legends for `Kethis, the Hidden Hand` only when the same turn can convert the permission into mana, cards, recursion, or a win attempt; keep graveyard density intact if the only result is replaying a low-impact legend into open interaction.

## Sideboard Map
- Role card: `Thoughtseize` is the default proactive protection against interaction, graveyard hate, sweepers, and faster combo. Add it against control, combo, midrange with discard/removal, and any opponent whose visible plan can stop a single committed `Kethis, the Hidden Hand` turn. It is worse against very low-curve creature decks when life loss and tempo matter more than information.

- Role card: `Pact of Negation` protects a chosen combo turn rather than a normal setup turn. Add it when the opponent is likely to fight on the stack or when one spell can end the game after `Kethis, the Hidden Hand`, `Retraction Helix`, `Mox Amber`, or `Jace, the Perfected Mind` is already assembled. It is bad when the deck cannot reliably pay on the next upkeep or when the opponent pressures life total with permanents instead of stack interaction.

- Role card: `Fatal Push` is the clean anti-creature tempo card. Add it against fast creatures, disruptive creatures, and pressure backed by removal. It is weaker against spell combo, planeswalker-heavy control, and creature-light graveyard hate unless Forge shows a specific creature that must die.

- Role card: `Force of Vigor` is the emergency answer to artifacts and enchantments that block graveyard, artifact, or activated-ability plans. Add it against permanent hate, artifact engines, enchantment pressure, and decks where removing two permanents can reopen the combo turn. It is bad when the opponent has few legal targets or when exiling a green card would consume the only engine piece.

- Role card: `Urza's Ruinous Blast` is a reset button for nonlegendary permanent pressure. Add it against creature battlefields, token boards, and permanent-heavy decks where Kethis can keep or rebuild from legendary permanents. It is poor against stack-based combo, sparse boards, or positions where this deck controls mostly nonlegendary permanents it needs immediately.

- Role card: `Bloodchief Ascension` is a slow alternate pressure plan for matchups where the opponent interacts heavily with the graveyard or stack and gives the game time. Card text check required for exact counters and trigger conditions; use it only when Forge-visible game flow supports a long damage/life-loss plan. It is bad against fast starts, exile-heavy pressure, and matchups where spending mana on a non-engine enchantment delays survival.

- Role card: `A-Minsc & Boo, Timeless Heroes` is a post-board threat for grindy games where opponents overload on graveyard hate or one-for-one removal. Card text check required for Historic/Alchemy exact wording; treat it as a non-combo pressure and card-advantage pivot only when the mana and board can support it. It is bad when tapping out exposes the combo player to lethal or when the opponent can ignore a planeswalker and win immediately.

Creature Aggro And Low-Curve Pressure
Side in: 4 Fatal Push; 1 Urza's Ruinous Blast
Cut: 1 Relic of Legends; 2 Oath of Nissa; 1 Malevolent Rumble; 1 Agatha's Soul Cauldron

Stack Interaction Control
Side in: 4 Thoughtseize; 2 Pact of Negation
Cut: 2 Agatha's Soul Cauldron; 1 Relic of Legends; 1 Malevolent Rumble; 1 Retraction Helix; 1 Oath of Nissa

Artifact Or Enchantment Hate Decks
Side in: 4 Thoughtseize; 1 Force of Vigor; 2 Pact of Negation
Cut: 1 Relic of Legends; 2 Oath of Nissa; 2 Malevolent Rumble; 1 Retraction Helix; 1 Agatha's Soul Cauldron

Grindy Midrange With Removal
Side in: 4 Thoughtseize; 1 Bloodchief Ascension
Cut: 1 Relic of Legends; 1 Oath of Nissa; 1 Retraction Helix; 1 Malevolent Rumble; 1 Agatha's Soul Cauldron

Faster Combo Or Graveyard Race
Side in: 4 Thoughtseize; 2 Pact of Negation
Cut: 2 Agatha's Soul Cauldron; 1 Relic of Legends; 1 Malevolent Rumble; 1 Retraction Helix; 1 Oath of Nissa

- Archetype rule: Against creature pressure, become a survival-combo deck. Add role cards: `Fatal Push`, `Urza's Ruinous Blast`. Reduce main-deck emphasis: slow mana artifacts, extra selection, and expensive payoff density. Keep enough `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, `Kethis, the Hidden Hand`, `Mox Amber`, and `Retraction Helix` to still threaten a sudden win after stabilizing.

- Archetype rule: Against control, protect the commitment turn instead of fighting every exchange. Add role cards: `Thoughtseize`, `Pact of Negation`, `A-Minsc & Boo, Timeless Heroes`. Reduce main-deck emphasis: redundant slow setup and graveyard-only pieces that fold to a single hate card. Use `Thoughtseize` to clear the exact answer before committing `Kethis, the Hidden Hand` or `Retraction Helix`; hold `Pact of Negation` for the spell that stops the chosen win.

- Archetype rule: Against permanent hate, sideboard for access plus prevention. Add role cards: `Thoughtseize`, `Force of Vigor`, `Pact of Negation`. Reduce main-deck emphasis: cards that do not answer hate or accelerate through it. Use `Thoughtseize` before the hate resolves when possible, `Force of Vigor` after Forge shows legal artifact/enchantment targets, and `Boseiju, Who Endures` as a main-deck answer when mana and timing allow.

- Archetype rule: Against midrange, preserve engine redundancy while adding disruption. Add role cards: `Thoughtseize`, `A-Minsc & Boo, Timeless Heroes`, `Bloodchief Ascension`. Reduce main-deck emphasis: the slowest setup pieces and low-impact duplicate payoffs. The role changes from all-in combo to resilient combo-control: trade early only for cards that prevent the opponent from breaking up `Kethis, the Hidden Hand`, then pivot to planeswalker or enchantment pressure if graveyard access is contested.

- Archetype rule: Against faster combo, prioritize information and stack protection over removal. Add role cards: `Thoughtseize`, `Pact of Negation`. Reduce main-deck emphasis: creature removal if present only from prior configuration, slow value permanents, and side plans that do not affect the opponent's decisive turn. Keep hands that deploy mana, selection, and disruption quickly; reject slow hands that only become powerful after multiple uncontested turns.

## Matchup Guidance

- Aggro: Play as survival-combo, not pure speed. Prioritize opening hands with `Delighted Halfling`, untapped colored mana, `Mox Amber` with a cheap legend, or `Fatal Push` after sideboarding. Preserve life from `Mana Confluence` when another land line casts the same spell. Use `Rona, Herald of Invasion` and `Emry, Lurker of the Loch` as blockers only when the legal board state says blocking buys a full turn or protects `Jace, the Perfected Mind`; do not trade away the only legend that enables `Mox Amber` unless survival requires it. Add role cards: `Fatal Push`, `Urza's Ruinous Blast`. Reduce main-deck emphasis: `Relic of Legends`, `Jegantha, the Wellspring`, slow extra selection, and nonessential graveyard setup.

- Burn: Treat life total as the primary resource until a deterministic combo window appears. Favor `Blooming Marsh`, `Botanical Sanctum`, `Breeding Pool` only when its life payment is unavoidable, `Plaza of Heroes`, and `Great Hall of the Citadel` over repeated `Mana Confluence` activations. Keep `Delighted Halfling` when it blocks or accelerates a protected `Kethis, the Hidden Hand`, but do not spend turns on `Malevolent Rumble` or `Oath of Nissa` if the visible clock makes a setup spell worse than presenting a blocker or combo threat. Add role cards: `Thoughtseize` only when taking a burn spell or hate card saves more life than the two-life cost; `Fatal Push` when creatures are the damage source. Reduce main-deck emphasis: slow artifacts and long-game pivots.

- Go-wide decks: Use spot removal to bridge into a reset or combo, not to answer every token. `Fatal Push` should hit the creature that adds the most immediate damage, grants team pressure, or disrupts combo mana; save `Urza's Ruinous Blast` for a board where exiling nonlegendary permanents materially changes lethal math or opens a safe `Kethis, the Hidden Hand` turn. Keep legendary permanents when possible because `Urza's Ruinous Blast` can leave `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, `Kethis, the Hidden Hand`, planeswalkers, and legendary lands as rebuild material. Add role cards: `Fatal Push`, `Urza's Ruinous Blast`. Reduce main-deck emphasis: cards that only improve graveyard volume without affecting the current board.

- Single-threat decks: Answer the threat only if racing is slower or the threat blocks the combo turn. `Fatal Push`, `Boseiju, Who Endures`, and `Takenuma, Abandoned Mire` channel lines should be considered from Forge-visible legal actions before committing engine pieces into combat. If the opponent has one large blocker and little pressure, prefer assembling `Retraction Helix` plus `Mox Amber` and a legend over attacking. Add role cards: `Fatal Push`, `Thoughtseize`, `Pact of Negation` when the single threat is protected by stack interaction. Reduce main-deck emphasis: broad reset plans unless the threat deck also floods the board.

- Tempo: Respect open mana and preserve redundancy. Use `Thoughtseize` to expose the opponent's exact interruption before committing `Kethis, the Hidden Hand`, `Retraction Helix`, or `Jace, the Perfected Mind`; use `Pact of Negation` only for the spell that breaks the selected combo or payoff turn. Sequence cheap permanents so the opponent must spend interaction before the decisive activation. Add role cards: `Thoughtseize`, `Pact of Negation`, sometimes `Fatal Push` for disruptive creatures. Reduce main-deck emphasis: `Relic of Legends`, excess slow selection, and fragile all-in lines without backup.

- Control: Win by forcing a protected commitment turn or by pivoting to independent threats. Do not run `Kethis, the Hidden Hand` into known removal or counterplay unless waiting gives the control deck more decisive resources than this deck gains. `Thoughtseize` should take the card that stops the current route, not merely the most expensive card. `Pact of Negation` should protect the turn that includes a real engine payoff, not a speculative setup spell. `A-Minsc & Boo, Timeless Heroes` is a post-board pressure pivot when graveyard hate or counterspells make the main combo unreliable; Card text check required for exact Historic/Alchemy wording. Add role cards: `Thoughtseize`, `Pact of Negation`, `A-Minsc & Boo, Timeless Heroes`, `Bloodchief Ascension` in slow games; Card text check required for `Bloodchief Ascension` counters and trigger conditions. Reduce main-deck emphasis: `Agatha's Soul Cauldron`, `Relic of Legends`, and low-impact setup that does not pressure or protect.

- Removal-heavy midrange: Make every threat either replace itself, threaten a combo, or draw removal away from the real engine. `Unearth` becomes stronger when the graveyard contains a killed `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, or `Kethis, the Hidden Hand`; use it after removal has traded, not before the opponent commits. `Takenuma, Abandoned Mire` is a valuable recovery land when the legal channel line returns a critical legend or planeswalker. Add role cards: `Thoughtseize`, `A-Minsc & Boo, Timeless Heroes`, `Bloodchief Ascension`. Reduce main-deck emphasis: the slowest noncreature engine pieces and redundant payoffs when the opponent is trading one-for-one.

- Big mana: Pressure the combo clock and disrupt the payoff, not the ramp unless the visible ramp action is the only path to a decisive next turn. Keep hands that present early `Kethis, the Hidden Hand`, `Retraction Helix`, `Mox Amber`, or `Jace, the Perfected Mind` pressure. `Thoughtseize` should target the payoff or sweeper that beats the chosen line. `Pact of Negation` is strong when the opponent's decisive turn is stack-based and this deck can win immediately after. Add role cards: `Thoughtseize`, `Pact of Negation`, sometimes `A-Minsc & Boo, Timeless Heroes` when games slow after sideboarding. Reduce main-deck emphasis: creature removal and narrow board control unless Forge shows must-kill creatures.

- Faster combo: Become the interactive combo deck. Mulligan slow hands that lack acceleration, selection, or disruption; a hand with `Delighted Halfling`, `Mox Amber`, a cheap legend, and `Thoughtseize` is usually better than a hand full of payoffs without early action. Use `Thoughtseize` for the card that starts or protects the opponent's kill, and hold `Pact of Negation` for the decisive spell if this deck can pay or win before the payment matters. Add role cards: `Thoughtseize`, `Pact of Negation`. Reduce main-deck emphasis: `Fatal Push` unless the combo relies on creatures, `Urza's Ruinous Blast`, and slow alternate threats.

- Graveyard decks: Race when this deck is faster; disrupt only when the opponent's graveyard line is visibly ahead. This list does not register dedicated graveyard hate, so sideboard plans should use `Thoughtseize`, pressure, and protected combo turns rather than pretending to exile cards. `Jace, the Perfected Mind` can be a win condition, but do not mill an opponent whose graveyard is an active resource unless the rules-engine state shows that milling is lethal, enables immediate victory, or the opponent cannot use the graveyard. Add role cards: `Thoughtseize`, `Pact of Negation`; add `Fatal Push` only for creature-based graveyard engines. Reduce main-deck emphasis: slow graveyard-value lines when the opponent punishes stocked graveyards faster.

- Artifact decks: Identify whether artifacts are pressure, hate, mana, or combo pieces before spending answers. `Force of Vigor` should be reserved for visible artifact or enchantment targets whose removal unlocks `Kethis, the Hidden Hand`, `Mox Amber`, `Retraction Helix`, or stops a decisive artifact engine. `Boseiju, Who Endures` is a main-deck answer when the legal channel mode is available and the tempo cost is lower than losing access to the combo. Add role cards: `Force of Vigor`, `Thoughtseize`, `Fatal Push` only for creature pressure, `Pact of Negation` for stack-protected artifact combo. Reduce main-deck emphasis: low-impact selection that fails to answer hate.

- Enchantment decks: Treat lock pieces and graveyard hate as priority targets. `Thoughtseize` should take the hate or payoff before it resolves when possible; `Force of Vigor` and `Boseiju, Who Endures` should answer the visible permanent after it resolves if legal. Do not exile the only green card to `Force of Vigor` if that card is required for the selected engine line and the enchantment is not currently stopping that line. Add role cards: `Force of Vigor`, `Thoughtseize`, `Pact of Negation`. Reduce main-deck emphasis: extra value pieces that do not remove or beat hate.

- Mixed unknown field: Default to proactive combo with light respect for removal. Keep hands that cast early legends and selection, build toward `Kethis, the Hidden Hand`, and contain a plausible `Jace, the Perfected Mind` or `Retraction Helix` payoff. Avoid speculative sideboard pivots until the opponent reveals whether the problem is speed, stack interaction, permanent hate, removal density, or a faster combo.

## Specific Matchup Notes

- General/archetype-only note: exact opponents are absent, so revealed cards, legal actions, public zones, and rules-engine prompts override every matchup assumption below. Treat early unknown games as proactive combo games until the opponent reveals whether the pressure point is speed, removal, graveyard hate, stack interaction, or permanent-based hate.

- Unknown Game 1: keep hands that deploy `Delighted Halfling`, `Mox Amber`, `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, or `Kethis, the Hidden Hand` early and can convert setup into `Jace, the Perfected Mind` or `Retraction Helix`. Prioritize protecting the first real engine turn over maximizing incidental value. Likely sideboarding after reveal: Add role cards matching the revealed pressure; use `Thoughtseize` and `Pact of Negation` against stack or combo pressure, `Fatal Push` against creature pressure, `Force of Vigor` against artifact or enchantment hate, and `A-Minsc & Boo, Timeless Heroes` or `Bloodchief Ascension` for slower attrition games where card text checks support the plan.

- Fast creature decks: prioritize survival long enough to assemble a compact engine rather than chasing perfect graveyard volume. `Fatal Push` should answer the creature that most changes the clock or disrupts `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, or `Kethis, the Hidden Hand`. `Delighted Halfling` and `Mox Amber` are mana pieces first and blockers only when blocking preserves a combo turn. Add role cards: `Fatal Push`, sometimes `Urza's Ruinous Blast` if the opponent's battlefield is nonlegendary and this deck can keep key legends. Reduce main-deck emphasis: slow selection and fragile nonessential engine pieces.

- Removal-heavy decks: sequence redundant legends before the decisive `Kethis, the Hidden Hand` or `Retraction Helix` turn when the visible game allows it. `Unearth` is strongest after the opponent has already traded with `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, or `Kethis, the Hidden Hand`; do not spend it just to fill mana unless the returned creature immediately enables a legal combo or mana line. Add role cards: `Thoughtseize`, `A-Minsc & Boo, Timeless Heroes`, `Bloodchief Ascension`. Priority targets are the removal spell or hate permanent that stops the selected turn.

- Control and stack interaction: force a protected commitment turn instead of exposing one engine piece at a time into open answers. `Thoughtseize` should take the answer to the current route, while `Pact of Negation` should be saved for the spell that stops the payoff or protects a winning `Jace, the Perfected Mind` turn. Add role cards: `Thoughtseize`, `Pact of Negation`, `A-Minsc & Boo, Timeless Heroes`, `Bloodchief Ascension` in slow games. Card text check required for `Bloodchief Ascension` and `A-Minsc & Boo, Timeless Heroes`.

- Artifact or enchantment hate decks: identify whether the visible permanent stops graveyard use, activated abilities, casting from graveyard, targeting, or mana before spending answers. `Boseiju, Who Endures` and `Force of Vigor` should remove the hate piece that unlocks `Kethis, the Hidden Hand`, `Emry, Lurker of the Loch`, `Mox Amber`, or `Retraction Helix`; do not trade them for low-impact permanents while the combo remains functional. Add role cards: `Force of Vigor`, `Thoughtseize`, sometimes `Pact of Negation`.

- Faster combo and graveyard decks: become the disruptive combo deck when the opponent is faster, and race when this deck's visible line is faster. `Thoughtseize` should target the card that starts, protects, or immediately pays off the opponent's kill. Do not use `Jace, the Perfected Mind` to stock an opposing graveyard unless the legal action is lethal, the opponent cannot use those cards, or the current board makes waiting worse.

## Risk Summary

- Mana risk: this deck needs colored mana, legends for `Mox Amber`, and untapped development in the same early turns. Hands with only `Great Hall of the Citadel`, awkward legendary-only mana, or no early legend can look functional but fail to cast `Retraction Helix`, `Malevolent Rumble`, `Oath of Nissa`, or `Jace, the Perfected Mind` on time.

- Matchup risk: unknown opponents punish the wrong role assignment. Overvaluing speed loses to visible hate or removal; overvaluing protection loses to faster combo or creature pressure.

- Draw risk: `Jace, the Perfected Mind`, `Kethis, the Hidden Hand`, and `Retraction Helix` are powerful but clunky in multiples without mana and graveyard setup. Mulligan hands that contain payoffs but no early permanent engine unless the matchup and legal play pattern justify the delay.

- Over-sideboarding risk: removing too many main-deck enablers breaks the combo shell. Keep enough `Delighted Halfling`, `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, `Kethis, the Hidden Hand`, `Mox Amber`, and selection to assemble a real engine after adding interaction.

- Graveyard risk: `Kethis, the Hidden Hand`, `Emry, Lurker of the Loch`, `Takenuma, Abandoned Mire`, and `Unearth` all become weaker into graveyard denial. Respect visible hate, but do not assume unseen hate exists unless revealed information or matchup context supports it.

- Sweeper/removal risk: single-engine battlefield states are fragile. Avoid committing `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, `Kethis, the Hidden Hand`, and `Tyvar, Jubilant Brawler` into a likely sweeper unless the current turn threatens a decisive payoff.

- Closer risk: `Jace, the Perfected Mind` is the cleanest payoff, but it can be stranded by pressure, counterplay, or graveyard punishment. Use `A-Minsc & Boo, Timeless Heroes`, `Bloodchief Ascension`, and `Urza's Ruinous Blast` only where their checked card text and visible board state support the pivot.

- Interaction risk: `Pact of Negation` can win the protected turn and lose the next upkeep if the game is not ending or the payment is impossible. Use it only when the protected action is decisive or the visible mana plan can satisfy the cost.

- Sequencing risk: `Retraction Helix` lines require the target, artifact, mana, and payoff to line up legally. Do not select a self-target or bounce line because it resembles the combo; verify the rules engine exposes the required target, activation, replay, and payoff actions.

## Test Feedback Checklist

- Deciding factor: record whether the game was won or lost by combo speed, graveyard access, mana development, creature pressure, stack interaction, removal, or a single hate permanent. Name the exact visible card or action that changed the game when possible, and mark unknowns as unknown instead of inferring hidden answers.

- Mulligan quality: compare each kept hand against the opening requirement of early mana plus an engine path involving `Delighted Halfling`, `Mox Amber`, `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, or `Kethis, the Hidden Hand`. Flag keeps that had payoffs like `Jace, the Perfected Mind` or `Retraction Helix` but no realistic setup.

- Mana function: log whether losses came from missing colors, having no early legend for `Mox Amber`, drawing too many painful sources such as `Mana Confluence`, or relying on `Great Hall of the Citadel` without enough legendary sequencing. Note whether `Plaza of Heroes`, `Boseiju, Who Endures`, or `Takenuma, Abandoned Mire` was used as a spell-like land or was forced to be ordinary mana.

- Velocity check: identify whether `Malevolent Rumble`, `Oath of Nissa`, `Emry, Lurker of the Loch`, and `Takenuma, Abandoned Mire` found meaningful resources or merely spent mana without advancing the decisive turn. Track games where selection was cast before establishing the mana or legend needed to use the found card.

- Engine integrity: record whether `Rona, Herald of Invasion`, `Kethis, the Hidden Hand`, `Emry, Lurker of the Loch`, `Agatha's Soul Cauldron`, `Relic of Legends`, and `Tyvar, Jubilant Brawler` created a functional engine or were stranded as disconnected pieces. Highlight any game where `Retraction Helix` had a legal target but no artifact loop, no payoff, or no mana follow-through.

- Removal and disruption impact: after sideboarded games, measure whether `Fatal Push`, `Thoughtseize`, `Pact of Negation`, `Force of Vigor`, and `Urza's Ruinous Blast` answered the card that actually mattered. Mark cases where interaction delayed the opponent but reduced this deck below the minimum engine density.

- Closing discipline: record whether `Jace, the Perfected Mind` ended the game, stocked the graveyard profitably, sat stranded, or exposed the deck to a counterattack. For `Bloodchief Ascension` and `A-Minsc & Boo, Timeless Heroes`, write Card text check required unless runtime card text was verified, then evaluate only the verified role.

- Role assignment: note whether the pilot correctly chose fast combo, protected combo, disruption-first, or attrition pivot. Flag mistakes where the deck played slowly against faster combo, overprotected against creature pressure, or spent `Pact of Negation` without a decisive turn or payable next upkeep.

- Stranded-card review: list cards stuck in hand for two or more turns and why they were stranded. Common labels should include missing color, missing legend, no graveyard, no legal target, opponent hate, life pressure, or wrong sideboard role.

- Overperformers and underperformers: name the exact cards that repeatedly produced wins, stabilized losses, or failed in visible contexts. Separate card weakness from pilot error, matchup pressure, and rules-engine action availability.

## First Tuning Questions

- Main-deck size question: does the 61st card improve enough matchups to justify the extra variance, or should the configuration move toward 60 cards after identifying the least necessary role piece?

- Engine quantity question: are 4 `Rona, Herald of Invasion`, 4 `Emry, Lurker of the Loch`, and 4 `Kethis, the Hidden Hand` producing enough redundancy, or are multiples causing stranded hands against removal and graveyard hate?

- Payoff quantity question: is 4 `Jace, the Perfected Mind` necessary for closing, or do repeated stranded copies suggest changing payoff density while preserving a deterministic finish?

- Setup quantity question: are 3 `Malevolent Rumble` and 2 `Oath of Nissa` enough to smooth early hands, or do losses show the deck needs more selection rather than more protection?

- Combo-piece question: does 3 `Retraction Helix` appear often enough when the engine is ready, or is the deck more often losing because the Helix line lacks a legal target, artifact, or payoff?

- Recursion question: does 2 `Unearth` recover key legends often enough against removal, or is it too narrow when opponents attack the graveyard or exile creatures?

- Mana-base question: do `Mana Confluence`, `Plaza of Heroes`, `Great Hall of the Citadel`, `Blooming Marsh`, `Breeding Pool`, and `Botanical Sanctum` support both early setup and sideboard interaction, or are colored bottlenecks forcing weak keeps and missed windows?

- Land-utility question: are 3 `Boseiju, Who Endures` and 2 `Takenuma, Abandoned Mire` improving hate and grind matchups, or are legendary land copies increasing awkward opening mana?

- Aggro-plan question: are 4 `Fatal Push` and 1 `Urza's Ruinous Blast` enough to survive fast creature decks, or does the sideboard need more early stabilization without diluting the engine?

- Control-plan question: are 4 `Thoughtseize`, 2 `Pact of Negation`, `Bloodchief Ascension`, and `A-Minsc & Boo, Timeless Heroes` creating a coherent protected or attrition plan, or do they pull the deck into conflicting roles?

- Hate-answer question: is 1 `Force of Vigor` plus 3 `Boseiju, Who Endures` enough against artifact and enchantment hate, or are losses concentrated around permanent types this deck cannot remove in time?

- Sideboard-size question: does the 14-card sideboard leave a missing tactical slot, and which matchup would gain the most from the fifteenth card without weakening the main engine plan?

## Veles Tactical Policy

### Policy: Opening Hand Engine Gate
Priority: High
Decision families: mulligan
Cards: Delighted Halfling; Mox Amber; Rona, Herald of Invasion; Emry, Lurker of the Loch; Kethis, the Hidden Hand; Malevolent Rumble; Oath of Nissa
Phase windows: opening hand; mulligan
Runtime cues: prompt:mulligan; opening hand visible
Use when: deciding keep or mulligan before any game actions.
Avoid when: a forced keep or London bottom prompt is already being resolved.
Instructions: Keep hands with two mana sources and at least one early engine route: `Delighted Halfling`, `Mox Amber` plus a legend, `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, `Kethis, the Hidden Hand`, or cheap selection that finds them. Mulligan hands with payoff-only cards, no early colored mana, no legend for `Mox Amber`, or no plan before turn three unless the hand has matchup-specific sideboard interaction and a clear second step.
Pilot skill floor: medium
No-API allowed: no
Light-model allowed: yes

### Policy: London Bottoms Protect The First Line
Priority: Medium
Decision families: mulligan; selection
Cards: Jace, the Perfected Mind; Retraction Helix; Jegantha, the Wellspring; Agatha's Soul Cauldron; Unearth
Phase windows: mulligan bottom
Runtime cues: prompt:bottom; action:put card on bottom
Use when: choosing cards to put on bottom after keeping a reduced hand.
Avoid when: the rules engine identifies only one legal bottom set.
Instructions: Bottom excess payoffs and slow duplicate legends before cutting the first mana source, first engine creature, or only selection spell. Preserve `Retraction Helix` only when the hand already has a legal creature and artifact/mana setup; preserve `Unearth` only when removal pressure is expected or an engine creature is already likely to die.
Pilot skill floor: medium
No-API allowed: no
Light-model allowed: yes

### Policy: Early Setup Permanent First
Priority: Medium
Decision families: mana; priority
Cards: Delighted Halfling; Mox Amber; Rona, Herald of Invasion; Emry, Lurker of the Loch; Kethis, the Hidden Hand; Relic of Legends
Phase windows: turns 1-3 main phases
Runtime cues: phase:main; action:cast; action:play
Use when: selecting the first creature, legend, artifact, or land development action.
Avoid when: opponent has lethal pressure requiring immediate interaction.
Instructions: Establish mana and a living engine before spending selection. Prefer `Delighted Halfling` when colored mana is constrained, prefer a cheap legend when `Mox Amber` needs activation, and prefer `Emry, Lurker of the Loch` or `Rona, Herald of Invasion` when graveyard/artifact loops are the visible route.
Pilot skill floor: medium
No-API allowed: no
Light-model allowed: yes

### Policy: Legendary Mana Discipline
Priority: Medium
Decision families: mana
Cards: Mox Amber; Plaza of Heroes; Great Hall of the Citadel; Mana Confluence; Delighted Halfling; Relic of Legends
Phase windows: all mana payment windows
Runtime cues: prompt:pay mana; action:activate mana ability
Use when: choosing mana sources for spells, abilities, or taxes.
Avoid when: the payment is fully forced by the rules engine.
Instructions: Spend painless and legend-restricted mana before painful `Mana Confluence` when colors remain covered. Keep untapped sources that can pay for `Retraction Helix`, `Unearth`, `Fatal Push`, `Thoughtseize`, or `Pact of Negation` when those cards are visible and relevant. Treat `Mox Amber` as inactive unless a controlled legend is visible.
Pilot skill floor: high
No-API allowed: no
Light-model allowed: yes

### Policy: Deterministic Mana Payment
Priority: Low
Decision families: mana
Cards: Mox Amber; Delighted Halfling; Relic of Legends; Plaza of Heroes; Great Hall of the Citadel
Phase windows: mana payment prompt
Runtime cues: action:pay; action:activate mana ability
Use when: exactly one legal action pays the required visible cost and no alternative legal mana action is listed.
Avoid when: more than one legal mana source or color choice is shown.
Instructions: Submit the sole legal payment action without strategic reasoning when the visible action list contains one matching payment option.
Pilot skill floor: low
No-API allowed: yes
Light-model allowed: yes

### Policy: Combo Commitment Gate
Priority: High
Decision families: priority; mana; selection
Cards: Kethis, the Hidden Hand; Rona, Herald of Invasion; Emry, Lurker of the Loch; Retraction Helix; Mox Amber; Jace, the Perfected Mind; Agatha's Soul Cauldron; Tyvar, Jubilant Brawler
Phase windows: main phase; priority with stack empty
Runtime cues: action:cast Retraction Helix; action:activate Kethis, the Hidden Hand; action:cast Jace, the Perfected Mind
Use when: deciding whether to start the main combo, expose a fragile engine, or tap out for the payoff.
Avoid when: the current prompt is only a deterministic target or mana payment after commitment.
Instructions: Commit when the visible line has mana, a live creature, recursion or redundancy against removal, and a payoff path; wait when a single removal spell, graveyard hate permanent, or missing artifact breaks the whole line and the opponent clock allows another setup turn.
Pilot skill floor: high
No-API allowed: no
Light-model allowed: yes

### Policy: Retraction Helix Target Self Setup
Priority: Medium
Decision families: interaction; priority
Cards: Retraction Helix; Rona, Herald of Invasion; Emry, Lurker of the Loch; Delighted Halfling
Phase windows: main phase; combo turn
Runtime cues: action:target self Retraction Helix; action:target self Rona, Herald of Invasion; action:target self Emry, Lurker of the Loch; action:target self Delighted Halfling
Use when: the legal action text targets a creature you control with `Retraction Helix` after the combo commitment gate has selected the line.
Avoid when: multiple controlled creatures are legal and the selected line has not named the target.
Instructions: Target the controlled creature named by the committed line. Prefer light-model reasoning when `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, and `Delighted Halfling` are all legal targets because tapping costs and untap triggers differ.
Pilot skill floor: medium
No-API allowed: no
Light-model allowed: yes

### Policy: Jace Payoff Target Opponent
Priority: High
Decision families: selection; priority
Cards: Jace, the Perfected Mind
Phase windows: combo finish; main phase
Runtime cues: action:target opponent Jace, the Perfected Mind
Use when: a legal `Jace, the Perfected Mind` action explicitly targets the opponent and the selected line is to finish by milling the opponent.
Avoid when: Jace mode, loyalty cost, or target identity is not visible in the legal action text.
Instructions: Choose the opponent target for the deterministic payoff line only after the commitment gate identifies Jace as the finish. Do not target self unless the visible line is explicitly a graveyard-setup line selected by reasoning.
Pilot skill floor: medium
No-API allowed: yes
Light-model allowed: yes

### Policy: Graveyard Access And Recursion
Priority: Medium
Decision families: selection; priority
Cards: Kethis, the Hidden Hand; Emry, Lurker of the Loch; Takenuma, Abandoned Mire; Unearth; Malevolent Rumble; Agatha's Soul Cauldron
Phase windows: main phase; graveyard selection prompts
Runtime cues: action:activate; action:cast from graveyard; prompt:choose card in graveyard
Use when: choosing what to return, cast, exile, or enable from the graveyard.
Avoid when: graveyard hate or replacement effects make the expected zone change uncertain.
Instructions: Prioritize restoring the missing engine card over generic card quantity. Choose `Kethis, the Hidden Hand`, `Rona, Herald of Invasion`, `Emry, Lurker of the Loch`, or `Mox Amber` when that card unlocks immediate mana or loop progress; choose payoff only when the engine is already active.
Pilot skill floor: high
No-API allowed: no
Light-model allowed: yes

### Policy: Selection Spell Discipline
Priority: Low
Decision families: selection; mana
Cards: Malevolent Rumble; Oath of Nissa; Emry, Lurker of the Loch; Takenuma, Abandoned Mire
Phase windows: early main phase; setup turns
Runtime cues: action:cast Malevolent Rumble; action:cast Oath of Nissa; prompt:choose card
Use when: resolving card selection or deciding whether to spend mana on velocity.
Avoid when: spending mana prevents casting the first engine creature this turn.
Instructions: Use selection to find missing categories, not redundant payoffs. Take mana when the hand is color-short, take a legend when `Mox Amber` is stranded, take engine access before `Jace, the Perfected Mind`, and keep graveyard-enabling choices aligned with `Kethis, the Hidden Hand` or `Emry, Lurker of the Loch`.
Pilot skill floor: medium
No-API allowed: no
Light-model allowed: yes

### Policy: Interaction Before Engine Dilution
Priority: Medium
Decision families: interaction; priority
Cards: Thoughtseize; Fatal Push; Boseiju, Who Endures; Force of Vigor; Urza's Ruinous Blast
Phase windows: precombat main; opponent combat; opponent end step
Runtime cues: action:cast Thoughtseize; action:cast Fatal Push; action:channel Boseiju, Who Endures; action:cast Force of Vigor; action:cast Urza's Ruinous Blast
Use when: a visible threat, hate permanent, or opposing combo piece competes with advancing the engine.
Avoid when: the opponent threat is not visible and the action would only guess at hidden information.
Instructions: Remove cards that stop the combo or end the game before spending interaction on low-pressure permanents. `Thoughtseize` should clear known disruption or faster combo pieces; `Fatal Push` should preserve life or engine creatures; `Boseiju, Who Endures` and `Force of Vigor` should answer visible artifact/enchantment hate when verified legal. Card text check required for any uncertain permanent type or legality.
Pilot skill floor: high
No-API allowed: no
Light-model allowed: yes

### Policy: Permission Commitment
Priority: High
Decision families: interaction; priority
Cards: Pact of Negation
Phase windows: stack response; combo turn protection
Runtime cues: action:cast Pact of Negation; prompt:respond
Use when: deciding whether to counter a visible spell during or before a decisive turn.
Avoid when: the deck cannot pay the next upkeep cost and the counter does not immediately secure a win or prevent a loss.
Instructions: Use `Pact of Negation` to protect a winning combo turn, stop a spell that breaks the engine mid-line, or prevent immediate loss. Do not spend it on ordinary tempo unless the next upkeep payment is visible and the exchange preserves the only winning path.
Pilot skill floor: high
No-API allowed: no
Light-model allowed: yes

### Policy: Priority Pass With Available Action
Priority: Medium
Decision families: priority
Cards: none
Phase windows: all priority windows
Runtime cues: action:pass; prompt:priority
Use when: pass is legal while at least one non-pass action is also legal.
Avoid when: stack, combat, or known hate has changed since the last reasoning frame.
Instructions: Pass only after confirming the non-pass actions do not improve mana, engine setup, protection, lethal setup, or survival. Give special scrutiny to passing with `Retraction Helix`, `Fatal Push`, `Thoughtseize`, `Pact of Negation`, `Boseiju, Who Endures`, or a castable engine piece visible.
Pilot skill floor: medium
No-API allowed: no
Light-model allowed: yes

### Policy: Combat Preserve Combo Bodies
Priority: Medium
Decision families: combat
Cards: Rona, Herald of Invasion; Emry, Lurker of the Loch; Kethis, the Hidden Hand; Delighted Halfling
Phase windows: declare attackers; declare blockers; combat damage
Runtime cues: prompt:attack; prompt:block; action:attack; action:block
Use when: assigning attacks or blocks with engine creatures.
Avoid when: lethal damage requires blocking or attacking and the rules engine exposes a forced survival line.
Instructions: Do not trade engine bodies for small damage unless the game is already on the beatdown plan or survival requires it. Preserve creatures needed for `Retraction Helix`, `Mox Amber`, `Kethis, the Hidden Hand`, `Emry, Lurker of the Loch`, and `Relic of Legends`; block aggressively only when the opponent clock beats the combo setup.
Pilot skill floor: medium
No-API allowed: no
Light-model allowed: yes

### Policy: Single Forced No-Block Or No-Attack
Priority: Low
Decision families: combat
Cards: none
Phase windows: declare attackers; declare blockers
Runtime cues: action:no attackers; action:no blocks
Use when: exactly one legal combat action is listed and it is `no attackers` or `no blocks`.
Avoid when: any creature attack or block assignment is also legal.
Instructions: Submit the sole listed combat action when the rules engine exposes no alternative combat assignment.
Pilot skill floor: low
No-API allowed: yes
Light-model allowed: yes

### Policy: Sideboard Role Selection
Priority: High
Decision families: sideboard; pregame
Cards: Thoughtseize; Fatal Push; Pact of Negation; Force of Vigor; Bloodchief Ascension; A-Minsc & Boo, Timeless Heroes; Urza's Ruinous Blast
Phase windows: sideboarding before games 2 and 3
Runtime cues: prompt:sideboard; match stage:post-board
Use when: choosing a legal sideboard plan.
Avoid when: the requested plan would cut below required engine density or violate registered 75 validation.
Instructions: Add `Fatal Push` and `Urza's Ruinous Blast` against creature pressure, `Thoughtseize` and `Pact of Negation` against combo/control, `Force of Vigor` against visible or expected artifact/enchantment hate, and attrition cards only when speed is less important. Card text check required for `Bloodchief Ascension` and `A-Minsc & Boo, Timeless Heroes` before relying on specific abilities.
Pilot skill floor: high
No-API allowed: no
Light-model allowed: yes

### Policy: Exact Sideboard Submission
Priority: Low
Decision families: sideboard
Cards: Thoughtseize; Fatal Push; Pact of Negation; Force of Vigor; Bloodchief Ascension; A-Minsc & Boo, Timeless Heroes; Urza's Ruinous Blast
Phase windows: sideboard submission
Runtime cues: action:submit sideboard plan
Use when: the legal action text exactly matches the already selected validated sideboard plan.
Avoid when: multiple legal sideboard plans remain available or validation status is absent.
Instructions: Submit the exact validated plan action and do not alter card counts at the execution step.
Pilot skill floor: low
No-API allowed: yes
Light-model allowed: yes

### Policy: Attrition Pivot Gate
Priority: Medium
Decision families: priority; selection; combat
Cards: Bloodchief Ascension; A-Minsc & Boo, Timeless Heroes; Jegantha, the Wellspring; Tyvar, Jubilant Brawler; Agatha's Soul Cauldron
Phase windows: post-board main phases; stalled games
Runtime cues: action:cast Bloodchief Ascension; action:cast A-Minsc & Boo, Timeless Heroes; action:cast Jegantha, the Wellspring; action:cast Tyvar, Jubilant Brawler; action:cast Agatha's Soul Cauldron
Use when: the combo is slowed by removal, graveyard pressure, or repeated disruption and an alternate permanent is legal.
Avoid when: the main combo can be started this turn with protection or when the alternate card text has not been verified.
Instructions: Pivot only when the board state rewards a slower permanent and the opponent is not presenting immediate lethal. Keep the combo core intact where possible; use alternate permanents to force resources or create pressure rather than replacing the primary plan.
Pilot skill floor: high
No-API allowed: no
Light-model allowed: yes
