相互破壊 {B}

ソーサリー

あなたが瞬速を持つパーマネントをコントロールしているかぎり、この呪文は瞬速を持つ。

この呪文を唱えるための追加コストとして、クリーチャー１体を生け贄に捧げる。

クリーチャー１体を対象とし、それを破壊する。

狩人と標的は互いに互いを出し抜いたと信じて死んだ。

Illustrated by PINDURSKI

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Ikoria: Lair of Behemoths #96

Only the English version of a Magic card receives Oracle updates and errata. View this card in English. (Scryfall note)
Once you announce that you’re casting Mutual Destruction, players can’t try to remove your permanents with flash to make it lose flash until you’re done casting it. If it loses flash after it’s been cast, it will still resolve if able. (2020-04-17)
You must sacrifice exactly one creature to cast this spell; you cannot cast it without sacrificing a creature, and you cannot sacrifice additional creatures. (2020-04-17)

The last time that the game checks whether you have permission to cast a spell is before costs are paid. If you sacrifice a creature with flash to cast Mutual Destruction and then have no other permanents with flash, you’ll legally finish casting Mutual Destruction even though it no longer has flash. In this case, abilities that trigger whenever you cast a spell with flash won’t trigger. (2020-04-17)