Rest in Peace is the single best card in this matchup: it exiles all graveyards on entry and exiles any card that would be put into a graveyard, meaning Goryo's Vengeance has nothing to reanimate and Griselbrand/Atraxa never come back. Consign to Memory cannot counter Goryo's Vengeance directly since it is a colored spell, but it can counter key triggered abilities like Atraxa's or Solitude's enter-the-battlefield triggers; keep in mind their deck runs Force of Negation and Spell Pierce, so Mystical Dispute (cheaper against their blue spells) helps push through your own Rest in Peace or key threats. Concerns about Rest in Peace affecting your own Ephemerate or Solitude are minimal since those cards don't use the graveyard as a resource. Board out clunky lands and narrow removal for the higher-impact graveyard hate and countermagic.