Cthulhu, Risen Dreamer

Whenever Cthulhu attacks, destroy target
creature or artifact an opponent controls.
Cthulhu's power is equal to the number of
maddness counters on the battlefield.
If there are fewer than five maddness counters
on the battlefield, transform Cthulhu.
That is not dead which can eternal lie,
And with strange aeons even death may die.