Form of the Squirrel is a rare Enchantment card from Unhinged (UNH), collector number 96. Current market price: $10.40 (foil $141.00), TCGplayer market prices via Scryfall.
As this enchantment enters, create a 1/1 green Squirrel creature token. You lose the game when that creature leaves the battlefield. Creatures can't attack you. You have shroud. You can't cast spells.