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瞬速
これが戦場に出たとき、あなたがコントロールしていてこれでないクリーチャー1体を対象とする。ターン終了時まで、それは頑強を得る。(それが死亡したとき、それの上に-1/-1カウンターがない場合、それを-1/-1カウンター1個が置かれた状態でオーナーのコントロール下で戦場に戻す。)

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:あなたがコントロールしているクリーチャー1体を対象とする。それの上から望む個数のカウンターを取り除く。起動はソーサリーとしてのみ行う。
If the target creature dies but that card leaves the graveyard before the persist ability resolves, it won't be returned to the battlefield.
If a creature has +1/+1 counters and -1/-1 counters on it, state-based actions remove the same number of each so that it has only one kind of those counters on it. A creature's persist ability can bring it back again if its -1/-1 counters are removed this way.
If a creature with persist that has +1/+1 counters on it receives enough -1/-1 counters to cause it to be destroyed by lethal damage or put into its owner's graveyard for having 0 or less toughness, persist won't trigger and the card won't return to the battlefield. That's because persist checks the creature as it last existed on the battlefield, and it still had -1/-1 counters on it at that point.