Black Widow, Double Agent is a uncommon Legendary Creature — Human Hero Villain card from Marvel Super Heroes (MSH), collector number 208. Current market price: $0.19 (foil $0.29), TCGplayer market prices via Scryfall.
Deathtouch Whenever a creature you control attacks alone, it gains first strike and menace until end of turn. (It can't be blocked except by two or more creatures.)