Anafenza, Kin-Tree Spirit
Legendary Creature — Spirit Soldier
Oracle Text
Whenever another nontoken creature you control enters, bolster 1. (Choose a creature with the least toughness among creatures you control and put a +1/+1 counter on it.)Rules for this card
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A keyword action that puts +1/+1 counters on the weakest creature a player controls. See rule 701.39, “Bolster.”
Rulings (2)
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Wizards of the CoastYou 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.
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Wizards of the CoastBolster 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.