Rest in Peace shuts off Graveyard Trespasser's recursive value and any Unholy Annex//Ritual Chamber graveyard synergies while exiling their yard outright. Knockout Blow is a clean two-for-one against their ground creatures (Badgermole Cub, Sentinel of the Nameless City) while gaining life against their grindy plan. Farewell is a catch-all answer to a wide board plus their enchantments like Unholy Annex. Cut the narrower March of Otherworldly Light and some card selection since this matchup is more about surviving discard and removal-heavy exchanges than filtering.

Soul-Guide Lantern disrupts Hearth Elemental's cost reduction (which counts instant/sorcery/adventure cards in their graveyard) and denies Eddymurk Crab a cheaper cast, while doubling as a cantrip artifact. Mystical Dispute is discounted against their many blue spells (Consider, Opt, Sleight of Hand, Get Out) and is a strong tempo play against their countermagic suite. Keep Supreme Verdict and Temporary Lockdown in to answer Sunderflock and their token-generating creatures; Consult the Star Charts is cut since card selection is less important than proactive disruption against this grindy tempo deck.

Mystical Dispute is discounted against their heavy blue suite (Deduce, Make Disappear, Negate) and is excellent at stopping their countermagic or Fable of the Mirror-Breaker. Test of Talents strips copies of key instants/sorceries like Indomitable Creativity or Fiery Impulse after countering one, denying rebuys. This is a control mirror where card quality and countering their big plays (Indomitable Creativity, Atraxa, Grand Unifier, Valgavoth, Terror Eater) matters more than cheap removal, so March of Otherworldly Light and some selection are trimmed for proactive counterspells.