Jyralon, the Decimator

+2: Jyralon deals 3 damage to target creature
-5: Destroy target creature, then put an number of loyalty counters on Jyralon equal to that creatures toughness
-18: All creatures your opponents control attack for each creature dies until next turn put out a 3/3 hydra head token with "dies put out a 3/3 hydra"