Containment Priest exiles Atraxa, Grand Unifier or Emrakul, the Aeons Torn the moment it would enter via Show and Tell or Sneak Attack, since those effects put the creature into play without casting it. Lavinia stops them from casting noncreature spells with mana value greater than the number of lands they control, which keeps spells like Sneak Attack and Omniscience off the stack early, and it counters spells cast without any mana spent, hitting a Force of Will that is cast by exiling a blue card. Consign to Memory offers extra cheap interaction against colorless spells or triggers. We cut clunky value creatures that are irrelevant against a deck trying to cheat in a giant threat early.