X is a rare Legendary Creature — Human Spy card from The List (Unfinity Foil Edition) (ULST), collector number 53. Current market price: — (foil $0.31), TCGplayer market prices via Scryfall.
As long as X is in X's owner's opponent's hand, X's owner may cast X and activate X's abilities. That opponent can't cast X and plays with their hand revealed. {U}{B}, {T}: Put X into target opponent's hand. {3}{U}{B}: You may play a land or cast a spell from the hand X is in. If you cast a spell this way, you cast it without paying its mana cost.