Lavabelly Sliver 
Creature — Sliver
Sliver creatures you control have "When this creature enters, it deals 1 damage to target player or planeswalker and you gain 1 life."
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL