Creature — Shapeshifter
Changeling Titan
Changeling (This card is every creature type.) Champion a creature (When this enters, sacrifice it unless you exile another creature you control. When this leaves the battlefield, that card returns to the battlefield.)
From Magic: The Gathering.
Exact printings
Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6o76yu4cddpb1hij1gjauq.