Sultai Aluren wants to resolve Show and Tell or Aluren and then Omniscience, with Atraxa and Acererak as the payoffs. Containment Priest exiles the creatures Show and Tell puts onto the battlefield, since they weren't cast. It does nothing against Aluren or Omniscience, because creatures cast for free are still cast. Mindbreak Trap costs {0} once they have cast three or more spells in a turn, so it can exile a Show and Tell, or a chain of free Aluren or Omniscience casts, in one go. Crop Rotation and Expedition Map are too slow and don't affect their plan. Boseiju, Who Endures stays in because its channel ability can destroy Aluren or Omniscience, which are both enchantments. Tormod's Crypt stays out: their deck has no real graveyard plan, and Acererak returns itself to hand rather than recurring from the graveyard. Keep Trinisphere and Karn in since they still tax their mana and find silver bullets.