クリーチャー — ゾンビ
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エンジン始動!(あなたが速度を持たないなら、1から始まる。速度はあなたの各ターンに1回、対戦相手がライフを失ったとき、1上がる。最高速度は4である。)
このクリーチャーが戦場に出たとき、黒の2/2のゾンビ・クリーチャー・トークン1体を生成する。
最高速度 — あなたがコントロールしているクリーチャー1体が死亡するたび、各対戦相手はそれぞれ1点のライフを失い、あなたは1点のライフを得る。
If an effect needs to know what a player’s speed is and that player doesn’t have a speed, their speed is considered 0.
Start your engines! isn’t a triggered ability. Increasing your speed to 1 is something that happens as a state-based action as soon as you control a permanent with the ability. Notably, this includes gaining control of a permanent with the ability that another player controls.
“Max speed — [ability]” means “As long as you have max speed, this object has [ability].” If the granted ability functions in a zone other than the battlefield, the max speed ability does too.
Your speed doesn’t change until a spell or ability says so, such as the inherent triggered ability that cares about opponents losing life during your turn. Notably, losing control of permanents with start your engines! doesn’t affect your speed.
A player “has max speed” if their speed is 4.
Each player tracks their speed (or lack thereof) separately. Increasing your speed has no effect on whether another player has speed.