Ravenous Squirrel 
Creature — Squirrel
Whenever you sacrifice an artifact or creature, put a +1/+1 counter on this creature.
, Sacrifice an artifact or creature: You gain 1 life and draw a card.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL