Amoeboid Changeling is a common Creature — Shapeshifter card from Lorwyn (LRW), collector number 51. Current market price: $0.77 (foil $15.65), TCGplayer market prices via Scryfall.
Changeling (This card is every creature type.) {T}: Target creature gains all creature types until end of turn. {T}: Target creature loses all creature types until end of turn.