Wanted Poster

{2}, {t}: Put a bounty counter on target creature.
Whenever a creature you control blocks or becomes blocked by a creature with a bounty counter, it gets +1/+1 until end of turn for each bounty counter on that creature.
"Fella on that poster came through here yesterday. Seemed surprised at the price on his head. Must've wanted it to be higher, given how he killed our sheriff last night. Didn't kill the deputy though."