When Elite Scaleguard enters, bolster 2. Whenever a creature you control with a +1/+1 counter on it attacks, tap target creature defending player controls.
2014-11-24
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 Abzan Skycaptain's bolster ability.
2014-11-24
You determine which creature to put counters on as the spell or ability that instructs you to bolster resolves.