Wall of Mourning

Defender When this creature enters, exile a card from the top of your library face down for each opponent you have. Coven — At the beginning of your end step, if you control three or more creatures with different powers, put a card exiled with this creature into its owner's hand.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6o72z748tdpb1h4f2zbdcr.