Cthulhu, the Great Horror

Flying, Trample, Protection from Instants
Annihilator X, where X is equal to the number
of cards in defending player's hand.
When Cthulhu is put into a graveyard from
anywhere, its owner shuffles their graveyard
into their library.
"I am the greatest of my kind. Bow before me,
Zendikar... the first among my thralls..."