Bill Cipher

Flying, Hexproof, Vigilance
If Bill Cipher would deal combat damage to a
player, that player puts a number of cards from
the top of their library into their graveyard equal
to Bill Cipher's power instead. Whenever a card
is put into an opponent's graveyard from their library, put a +1/+1 counter on Bill Cipher.
"You can't stop me! I'm a being of pure energy with
no weakness!"