Abhorrent Oculus is a mythic Creature — Eye card from Duskmourn: House of Horror (DSK), collector number 344. Current market price: $13.18 (foil $19.75), TCGplayer market prices via Scryfall.
As an additional cost to cast this spell, exile six cards from your graveyard. Flying At the beginning of each opponent's upkeep, manifest dread. (Look at the top two cards of your library. Put one onto the battlefield face down as a 2/2 creature and the other into your graveyard. Turn it face up any time for its mana cost if it's a creature card.)