Eye of Yawgmoth is a rare Artifact card from Nemesis (NEM), collector number 129. Current market price: $0.29 (foil $6.47), TCGplayer market prices via Scryfall.
{3}, {T}, Sacrifice a creature: Reveal a number of cards from the top of your library equal to the sacrificed creature's power. Put one into your hand and exile the rest.