Dark-Dweller Oracle is a rare Creature — Goblin Shaman card from Core Set 2019 (M19), collector number 134. Current market price: $0.33 (foil $0.52), TCGplayer market prices via Scryfall.
{1}, Sacrifice a creature: Exile the top card of your library. You may play that card this turn. (You still pay its costs. You can play a land this way only if you have an available land play remaining.)