クリーチャー — ビホルダー
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対戦相手がコントロールしているクリーチャー1体があなたの対戦相手1人を攻撃するたび、ターン終了時まで、それのパワーを2倍にする。



:怪物化Xを行う。
デス・キスが怪物的になったとき、対戦相手がコントロールしているクリーチャー最大X体を対象とする。それらを使嗾する。
To double a creature's power, it gets +X/+0, where X is its power as that ability resolves.
Once a creature becomes monstrous, it can't become monstrous again. If the creature is already monstrous when the monstrosity ability resolves, nothing happens.
Monstrous isn't an ability that a creature has. It's just something true about that creature. If the creature stops being a creature or loses its abilities, it will continue to be monstrous.
An ability that triggers when a creature becomes monstrous won't trigger if that creature isn't on the battlefield when its monstrosity ability resolves.