Witch-king, Sky Scourge

Flying Whenever you attack with one or more Wraiths, exile the top X cards of your library, where X is their total power. You may play those cards this turn. Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6o3dug19uppb1hcxrs7ih8.