Bill Cipher, Nightmare

Bill Cipher, Nightmare gets +1/+1 for each card
your opponents own in exile.

Whenever Bill Cipher or another Nightmare or
Horror you control enters, target opponent exiles
cards from the top of their library until they exile
a land card.

"A-X-O-L-O-T-L! My time has come to burn!
I invoke the ancient power that I may return!"