Mutual Destruction
Sorcery
This spell has flash as long as you control a permanent with flash.
As an additional cost to cast this spell, sacrifice a creature.
Destroy target creature.
As an additional cost to cast this spell, sacrifice a creature.
Destroy target creature.
フォーマット
スタンダード : 不可パイオニア : 可能モダン : 可能レガシー : 可能ヴィンテージ : 可能パウパー : 可能統率者戦 : 可能デジタル専用フォーマット
アルケミー : 不可エクスプローラー : 可能ヒストリック : 可能タイムレス : 可能同名カード
イコリア：巨獣の棲処#96日本語
カード裁定
2020/04/17
原文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
原文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
原文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.
data from gatherer