Goryo's Vengeance is a reanimator combo deck that either reanimates Atraxa or Griselbrand via Goryo's Vengeance for a one-turn blowout, or grinds with Psychic Frog and Quantum Riddler backed by Thoughtseize disruption — your primary goal is to counter their key reanimation spells and protect your graveyard hate. Rest in Peace is your most powerful sideboard card here, completely shutting off Goryo's Vengeance, Ephemerate recursion, and the Psychic Frog graveyard trigger if it resolves. Mystical Dispute and Consign to Memory provide additional counterspell redundancy to protect Rest in Peace or counter Goryo's Vengeance directly, while Force of Negation is a free answer when they attempt a surprise reanimate through your shields. Teferi, Time Raveler is excellent here both to bounce Rest in Peace protectively and to disable their ability to hold up Consign to Memory shields. Creature removal comes out since their few creatures (Psychic Frog, Solitude) are handled by Prismatic Ending, and Thoughtseize hits make having excess non-interactive cards very costly.