Sneak and Show aims to cheat in Emrakul, the Aeons Torn, Griselbrand, or Atraxa, Grand Unifier via Show and Tell or Sneak Attack, which largely sidesteps our removal-based interaction, so Ensnaring Bridge is key since none of their giant creatures can attack through it while our hand is low (note it does not stop Emrakul's extra-turn trigger, only its attack). Mycosynth Lattice makes every permanent an artifact, which turns on metalcraft for Urza's Workshop and helps close games faster. Defense Grid is cut since it does nothing against Show and Tell (a sorcery cast on their own turn) or Sneak Attack's ability, and the creatures they put onto the battlefield are never cast. Expedition Map is cut as too slow in a matchup this fast. We keep Pithing Needle and Karakas in the deck because both are live here: Pithing Needle naming Sneak Attack shuts off its activated ability (or can name Griselbrand to stop its draw ability), and Karakas can return any of their legendary finishers (Emrakul, Griselbrand, Atraxa) to hand. Tormod's Crypt stays in the sideboard since their deck isn't graveyard-dependent and it would do almost nothing.