Shapeshifter is a rare Artifact Creature — Shapeshifter card from Antiquities (ATQ), collector number 64. Current market price: $9.37, TCGplayer market prices via Scryfall.
As this creature enters, choose a number between 0 and 7. At the beginning of your upkeep, you may choose a number between 0 and 7. Shapeshifter's power is equal to the last chosen number and its toughness is equal to 7 minus that number.