UBG Reanimator relies heavily on the graveyard via Animate Dead, Reanimate, and Shallow Grave to cheat Griselbrand or Atraxa, Grand Unifier into play, so Tormod's Crypt can exile their graveyard to deny the reanimation targets. Containment Priest stops those same reanimation effects, since Griselbrand or Atraxa would be exiled instead of entering the battlefield when put there by Animate Dead, Reanimate, or Shallow Grave. Crop Rotation and Expedition Map are cut as too slow against a deck trying to win by turn two or three. Keep Trinisphere in, as it is devastating against their one-mana Dark Ritual and Unmask-based plan.