Viper, Cruel Conspirator is a rare Legendary Creature — Human Assassin Villain card from Marvel Super Heroes Commander (MSC), collector number 673. Current market price: $0.28 (foil $0.67), TCGplayer market prices via Scryfall.
{B}: Target creature that's attacking alone gets +1/+1 until end of turn. {B}: Target creature that's attacking alone gains your choice of deathtouch or lifelink until end of turn.