Havok, Cosmic Powerhouse

Whenever a creature controlled by an opponent
dies, put a +1/+1 counter on Havok, Cosmic
Powerhouse.
Remove X +1/+1 counters from Havok: Havok
deals X damage to any target and gains flying
until end of turn.
"We wear these things so people don't know who we
are. But I want you to know exactly who I am."