Elite Scaleguard
Creature — Human Soldier
When this creature enters, bolster 2. (Choose a creature with the least toughness among creatures you control and put two +1/+1 counters on it.)
Whenever a creature you control with a +1/+1 counter on it attacks, tap target creature defending player controls.
Steve Prescott
Rulings
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.
(wotc • 2014-11-24)
You determine which creature to put counters on as the spell or ability that instructs you to bolster resolves.
(wotc • 2014-11-24)
Rulings
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.
(wotc • 2014-11-24)
You determine which creature to put counters on as the spell or ability that instructs you to bolster resolves.
(wotc • 2014-11-24)