Gareth, Underhaven Protector

Defender, First Strike
When a creature deals combat damage to you,
put a bounty counter on it.
When Gareth, Ravenholm Protector blocks a
creature with a bounty counter on it, it gets
+1/+0 and deathtouch until end of turn.
When a creature with a bounty counter on it dies,
put a +1/+1 counter on another target creature.