Blood Hound 
Creature — Dog
Whenever you're dealt damage, you may put that many +1/+1 counters on this creature. At the beginning of your end step, remove all +1/+1 counters from this creature.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL