Cthulhu, Great Old One

Chtulhu, Great Old One gets +1/+1 for each card
your opponents own in exile.

Whenever Chtulhu or another Nightmare or Horror enters the battlefield under your control, target
opponent exiles cards from the top of their library
until they exile a land card.

“In his house at R’lyeh dead Cthulhu waits
dreaming.” -H.P. Lovecraft