Moonstone, Harsh Mistress is a uncommon Legendary Creature — Human Doctor Villain card from Marvel Super Heroes (MSH), collector number 447. Current market price: — (foil $2.04), TCGplayer market prices via Scryfall.
Flying Whenever you discard a card, you may exile that card from your graveyard. If you do, until the end of your next turn, you may play that card.