クリーチャー — マーフォーク・兵士
2 / 2
深みの古参兵がタップ状態になるたび、あなたはそれの上に+1/+1カウンターを1個置いてもよい。
This is a triggered ability, not an activated ability. It doesn’t allow you to tap the creature whenever you want; rather, you need some other way of tapping it, such as by attacking with the creature.