Goryo's Vengeance is a mythic Instant — Arcane card from Duskmourn: House of Horror Commander (DSC), collector number 372. Current market price: — (foil $12.72), TCGplayer market prices via Scryfall.
Return target legendary creature card from your graveyard to the battlefield. That creature gains haste. Exile it at the beginning of the next end step. Splice onto Arcane {2}{B} (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)