Undercover Skrull is a common Creature — Skrull Shapeshifter Villain card from Marvel Super Heroes (MSH), collector number 194. Current market price: $0.11 (foil $0.22), TCGplayer market prices via Scryfall.
As long as there are two or more creature cards in your graveyard, this creature gets +2/+2 and is all creature types. {T}: Add one mana of any color.