インスタント
鼓舞4を行う。(あなたがコントロールするクリーチャーの中で最も小さいタフネスを持つクリーチャーを1体選び、それの上に+1/+1カウンターを4個置く。)
You determine which creature to put counters on as the spell or ability that instructs you to bolster resolves. That could be the creature with the bolster ability, if it’s still under your control and has the least toughness.