Goblin Dark-Dwellers is a rare Creature — Goblin card from Oath of the Gatewatch Promos (POGW), collector number 110. Current market price: — (foil $0.29), TCGplayer market prices via Scryfall.
Menace (This creature can't be blocked except by two or more creatures.) When this creature enters, you may cast target instant or sorcery card with mana value 3 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead.