Cataclysm Herald

{1}{r}: Potential 6 (If this creature hasn't reached its potential, put a +1/+1 counter on it. When the sixth +1/+1 counter is placed on this creature, it reaches its potential.)
When Cataclysm Herald reaches its potential, it deals 6 damage to each creature, planeswalker and player.
"The first Cataclysm was nothing compared to the destruction that approaches."