Changeling Berserker is a uncommon Creature — Shapeshifter card from Lorwyn (LRW), collector number 160. Current market price: $0.43 (foil $6.49), TCGplayer market prices via Scryfall.
Changeling (This card is every creature type.) Haste 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.)