Goryo's Vengeance wants to discard Atraxa, Grand Unifier or Griselbrand and reanimate it with the instant Goryo's Vengeance, so Rest in Peace is devastating here since it exiles cards headed to the graveyard, stopping the reanimation target entirely. Mystical Dispute is cheap against their heavy blue suite (Force of Negation, Faithful Mending, Quantum Riddler). Orim's Chant is too passive against a combo deck that just needs one resolved spell at instant speed, and Prismatic Ending struggles to hit their key enablers efficiently, so trim both. Keep Narset, Parter of Veils in to shut off their card-selection engines like Quantum Riddler and Faithful Mending, and prioritize countering Goryo's Vengeance itself over exiling the reanimation target when possible.