Anafenza, Kin-Tree Spirit
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.)
The Machine Legion coveted her strength, but a spirit of sand, sun, and memory could never be *compleated*.
Illustrated by Domenico Cava
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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.
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.
