Sengir Bats 
Creature — Bat
Flying Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL
Creature — Bat
Flying Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature.