Abzan Advantage

Set
Fate Reforged
Rarity
Common
Text
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.)
Legality
Legal in: Commander, Duel, Legacy, Modern, Pauper, Penny, Vintage
Rulings
2014-11-24: You can target any player with Abzan Advantage, even if that player doesn’t control an enchantment.

2014-11-24: The enchantment will have already left the battlefield when you bolster 1.

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.