Anafenza, Kin-Tree Spirit

Anafenza, Kin-Tree Spirit {W}{W}

Legendary Creature - Spirit Soldier | Power/Toughness: 2 / 2 (CMC 2)
Whenever another nontoken creature enters the battlefield under your control, bolster 1. (Choose a creature with the least toughness among creatures you control and put a +1/+1 counter on it.)