Lightbane Leviathan

When a Being or Creature card is destroyed on
the opponent's field, Lightbane Leviathan gains
+1/+1 to its attack/defense values.
Pyrokinetic Blast {b}{b}{b} (Lightbane Leviathan targets one Being or Creature on the opponent's
field and deals 4 damage to it. For the next two
turns, if the targeted card survived, reduce its attack/defense values by -2/-2).