インスタント
攻撃かブロックしているクリーチャー1体を対象とし、それを破壊する。鼓舞1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1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.
Bolster itself doesn’t target any creature, though some spells and abilities that bolster may have other effects that target creatures. For example, you could put counters on a creature with protection from white with Aven Tactician’s bolster ability.