Changeling Berserker is a uncommon Creature — Shapeshifter card from The List (PLST), collector number LRW-160. Current market price: $0.25, 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.)