Omni-Tell wants to resolve Show and Tell into Omniscience and then chain free spells for a lethal Emrakul, the Aeons Torn or Atraxa, Grand Unifier, so Consign to Memory is valuable to counter colorless spells like Lotus Petal-fueled plays or triggered abilities, and Silent Gravestone can proactively deny any graveyard recursion plans while also protecting our own resources. Murktide Regent is far too slow against a deck that can end the game on turn two or three via Show and Tell, so it comes out in favor of more interaction, and Force of Negation is trimmed slightly since by the time Show and Tell resolves the free counter window may already be gone, though we still keep some copies. Keep Force of Will and Swords to Plowshares at full count to counter their key spells and answer a resolved Atraxa, and prioritize disrupting their Show and Tell or Omniscience before it lands. This matchup is a race to disrupt the combo before it goes off, so countermagic density and proactive graveyard denial are the priority.