Containment Priest is the single best hate card against this reanimator deck, exiling any nontoken creature they try to cheat into play with Reanimate, Animate Dead, or Shallow Grave instead of letting it enter, which stops Griselbrand, Atraxa, Grand Unifier, and Archon of Cruelty cold. Force of Negation lets us counter their Reanimate or Animate Dead for free on their turn before the big creature resolves. Surgical Extraction can strip their Griselbrand or Archon of Cruelty out of the graveyard and hand/library combo pieces entirely once we see one. We trim slower, less-impactful cards like Quantum Riddler, Snapcaster Mage, and one Karakas since this matchup is about disrupting their fast combo turns, not grinding card advantage.