Abzan Skycaptain

Set
Fate Reforged
Rarity
Common
Text
Flying When Abzan Skycaptain dies, bolster 2. (Choose a creature with the least toughness among creatures you control and put two +1/+1 counters on it.)
Legality
Legal in: Commander, Duel, Legacy, Modern, Pauper, Penny, Vintage
Rulings
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.