Elektra, Femme Fatale is a uncommon Legendary Creature — Human Assassin Hero card from Marvel Super Heroes Commander (MSC), collector number 687. Current market price: $0.29 (foil $1.67), TCGplayer market prices via Scryfall.
When Elektra enters, you may have her deal 2 damage to you. When you do, she deals 4 damage to target creature.