Killmonger, Scourge of Wakanda is a uncommon Legendary Creature — Human Mercenary Villain card from Marvel Super Heroes (MSH), collector number 218. Current market price: $0.15 (foil $0.23), TCGplayer market prices via Scryfall.
When Killmonger enters, you may sacrifice another creature. When you do, destroy target nonland permanent an opponent controls. As long as there are two or more creature cards in your graveyard, Killmonger gets +2/+1.