ソーサリー
犠牲3(あなたがこの呪文を唱えるに際し、あなたはパワーが3以上であるクリーチャー1体を生け贄に捧げてもよい。そうしたとき、この呪文をコピーする。)
あなたのライブラリーからカード1枚を探し、あなたの手札に加え、その後ライブラリーを切り直す。
Casualty N means “As an additional cost to cast this spell, you may sacrifice a creature with power N or greater.” and “When you cast this spell, if a casualty cost was paid for it, copy it. If the spell has any targets, you may choose new targets for the copy.”
The copy of the spell is created on the stack, so it's not “cast.” Abilities that trigger when a player casts a spell won't trigger.
You may sacrifice only one creature to pay a spell's casualty cost, and you copy the spell only once.
If you pay the casualty cost of a spell, the copy will resolve before the original spell.