Cthulhu

Indestructible, Flying
As long as your devotion to blue is
more than 10, Cthulhu isn't a creature.
{10}{u}: Cthulhu deals 10 damage to each planeswalker, creature, and opponent, then is shuffled back into the controller's library.
That is not dead which can eternal lie, and
with strange aeons, even death may die.