Morith-Keel, Star Devourer

Flying

Whenever Morith-Keel enters or attacks, exile the
top X cards of your library, where X is the number
of creatures you control with power 4 or greater.
You may play those cards until your next end step.
At the beginning of your next end step, Morith-Keel deals 2 damage to each opponent for each of those cards that are still exiled.