Sally Sparrow is a rare Legendary Creature — Human Detective card from Doctor Who (WHO), collector number 760. Current market price: — (foil $0.87), TCGplayer market prices via Scryfall.
You may cast creature spells as though they had flash. Whenever one or more other creatures you control leave the battlefield, investigate. This ability triggers only once each turn. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")