Containment Priest is the best card in this matchup: it exiles any nontoken creature that enters without being cast, so Show and Tell and Sneak Attack activations just lose Atraxa, Emrakul, or Griselbrand instead of winning the game. It does not stop Omniscience, because creatures cast for free are still cast. Surgical Extraction strips a Show and Tell or another key card from their graveyard, hand, and library once a copy hits the graveyard, slowing their ability to find the combo again. Pyroblast answers their blue cantrips (Brainstorm, Ponder, Stock Up) and blue counterspells (Force of Will, Flusterstorm) at minimal cost. Thalia stays in, since noncreature spells like Show and Tell, Sneak Attack, Brainstorm, and Ponder all cost {1} more. Static Prison comes out because it is only a temporary answer: it needs energy to stay on the battlefield, so whatever it exiles comes back, and the deck's threats are huge ones it can simply rebuild around. Hexing Squelcher, Sand Scout, and Goblin Bombardment are cut as the least impactful cards against a deck that wants to resolve one huge threat rather than fight on the board.