Fatal Push and Prismatic Ending struggle against Emrakul, the Promised End and the big Eldrazi threats, so trim them for proactive disruption. High Noon slows their ramp-into-Emrakul plan by restricting them to one spell per turn, which is brutal against a deck that wants to chain Ancient Stirrings into lands into threats. Mystical Dispute is a cheap catch-all that can snag Kozilek's Command or any blue-costed spell they splash, though most of their deck is colorless/green. Keep Thoughtseize and Solitude as your main interaction against Emrakul and Devourer of Destiny.

Quantum Riddler is a clunky five-drop against their fast starts. It survives Lightning Bolt as a 4/6, but Flare of Malice can still force you to sacrifice it as your highest mana value creature. Trim it for White Orchid Phantom, which blocks well as a 2/2 flying first strike. Its enter trigger can also destroy a nonbasic land like Blood Crypt, though they may fetch a basic land tapped in return. Adding the extra Swamp smooths your black-heavy removal suite since Fatal Push and Thoughtseize are both critical against their aggressive Rakdos Delirium plan. Keep Solitude and Orcish Bowmasters as premium answers to their early creatures and graveyard-fueled threats like Nethergoyf. This matchup is a razor-thin race, so prioritize cheap interaction over card advantage plans.

Fatal Push is largely dead since Esper Control runs very few cheap creatures; Solitude is their main creature and sits above Push's range. Prismatic Ending stays in, since it can answer Teferi or Narset if you can spend enough colors of mana. Consign to Memory counters colorless spells and triggered abilities, so it answers Isochron Scepter and Solitude's enter trigger. It does nothing against activated abilities like Jace's loyalty abilities or Isochron Scepter's activation, and it can't counter white spells such as March of Otherworldly Light. Mystical Dispute costs {2}{U}, or just {U} when it targets a blue spell, which makes it cheap against their many blue spells like Day's Undoing, Narset, Jace, and their counterspells. Keep Thoughtseize and Orcish Bowmasters as premium disruption against their control shell.