Sneak and Show wants to cheat Atraxa, Grand Unifier or Emrakul, the Aeons Torn into play via Show and Tell or Sneak Attack. Emrakul can't be countered, so we have to stop the enabler instead of the payoff. Extra Consign to Memory is still useful because it can counter Atraxa's enters trigger or Emrakul's extra-turn cast trigger, and it also answers colorless spells like Lotus Petal. We keep Stifle in, since it can counter the activated ability of Sneak Attack, although it can't stop Show and Tell because that is a sorcery spell and not an ability. We trim Prismatic Ending since it is too hard to hit their relevant permanents, such as a four-mana-value Sneak Attack, with the colors we can spend. Force of Will and Force of Negation in our main deck remain our most important interaction to stop Show and Tell and Sneak Attack before they resolve. Keep our clock honest with Tamiyo, Phelia, and Quantum Riddler since this matchup is often a race if our countermagic whiffs.