Selvis the Devourer

+1: Destroy a target creature you control. This ability's modifier then becomes that creatures toughness.
-5: Destroy a target Creature an opponent controls. You gain Life equal to that creature's power.
-15: Selvis the Devourer Deals 15 Damage to every creature and reduces the loyalty counters of other planeswalkers by 8. You gain 4 Life.