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
Commander Masters (CMM)
• #22Rulings
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)