Dromoka's Gift

• WWizards of the Coast2015-02-25
  Official Ruling
  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 Aven Tactician’s bolster ability.
• WWizards of the Coast2015-02-25
  Official Ruling
  You determine which creature to put counters on as the spell or ability that instructs you to bolster resolves. That could be the creature with the bolster ability, if it’s still under your control and has the least toughness.

Rulings via Scryfall