Target player sacrifices an enchantment. Bolster 1. (Choose a creature with the least toughness among creatures you control and put a +1/+1 counter on it.)
11/24/2014 You can target any player with Abzan Advantage, even if that player doesn’t control an enchantment.
11/24/2014 The enchantment will have already left the battlefield when you bolster 1.
11/24/2014 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.
11/24/2014 You determine which creature to put counters on as the spell or ability that instructs you to bolster resolves.