クリーチャー — オーガ・戦士
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反抗するオーガが戦場に出たとき、以下から1つを選ぶ。
• 反抗するオーガの上に+1/+1カウンターを1個置く。
• アーティファクト1つを対象とし、それを破壊する。
You choose which mode you're using as you put the ability on the stack, after the creature has entered the battlefield. Once you've chosen a mode, you can't change that mode even if the creature leaves the battlefield in response to that ability.
If a mode requires a target and there are no legal targets available, that mode can't be chosen. You must choose another mode if able.