賢者眼の報復者

果敢（あなたがクリーチャーでない呪文を１つ唱えるたび、ターン終了時まで、このクリーチャーは＋１/＋１の修整を受ける。）
賢者眼の報復者が攻撃するたび、クリーチャー１体を対象とする。それのパワーが賢者眼の報復者のパワーよりも小さいなら、あなたはそれをオーナーの手札に戻してもよい。

Sage-Eye Avengers

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever Sage-Eye Avengers attacks, you may return target creature to its owner's hand if its power is less than Sage-Eye Avengers's power.

Duel Decks: Mind vs. Might

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Any spell you cast that doesn’t have the type creature will cause prowess to trigger. If a spell has multiple types, and one of those types is creature (such as an artifact creature), casting it won’t cause prowess to trigger. Playing a land also won’t cause prowess to trigger.

Once it triggers, prowess isn’t connected to the spell that caused it to trigger. If that spell is countered, prowess will still resolve.

Prowess goes on the stack on top of the spell that caused it to trigger. It will resolve before that spell.

Prowess triggers only once for any spell, even if that spell has multiple types.