Eldrazi wants to resolve huge colorless threats like Emrakul, the Promised End and ramp off Eldrazi Temple/Urza's Saga; Consign to Memory stops the colorless spells and incidental triggers cold. Break the Ice (overloaded) blows up their land-heavy manabase including Eldrazi Temple and Ugin's Labyrinth, slowing their ramp plan significantly. Thoughtseize is weak since their deck is proactive and resilient to discard, and Prismatic Ending struggles against their colorless permanents (it can't hit devoid threats cast with colorless mana efficiently and they have few colored permanents worth exiling). Keep your removal suite and reanimation plan intact to race before they assemble their big threats.

Rakdos Delirium is a fast graveyard-value aggro deck with Nethergoyf, Moonshadow, and Lightning Bolt backed by Thoughtseize. Their manabase is fetches, Blood Crypt, Raucous Theater, and basics, none of which are snow or produce colorless mana, so Break the Ice has nothing to hit and stays in the sideboard. Consign to Memory is the card to bring in: it counters their colorless spells (Mishra's Bauble, Nihil Spellbomb) and, more importantly, their triggered abilities, such as Orcish Bowmasters' ping and amass or Stitcher's Supplier's mill. It cannot counter their colored spells like Street Wraith. Faithful Mending is too slow against their low curve of 1-2 mana threats and burn, so trimming it for cheap interaction helps you survive the early beatdown. Keep Solitude and Prismatic Ending as your primary answers to their small creatures, and keep Quantum Riddler in as a sturdy flying threat.

Esper Control leans on wraths (Supreme Verdict, Wrath of the Skies) and planeswalkers (Teferi, Time Raveler, Narset, Parter of Veils). Force of Negation counters any noncreature spell, so it hits Wrath of the Skies and the planeswalkers, but not Supreme Verdict, which can't be countered. On their turn you can cast it for free by exiling a blue card from your hand. Timing matters because Teferi, Time Raveler stops you from casting spells except at sorcery speed, free or not. Use Force of Negation to counter Teferi as it is cast, before it resolves, rather than counting on it once Teferi is on the battlefield. Break the Ice stays in the sideboard: it only destroys snow lands or lands that can produce {C}, and their fetches and colored duals do neither, so it would hit almost nothing. Prismatic Ending comes out because it can only exile Teferi or Narset if you spend three colors of mana on it. It cannot reach Jace or Solitude, and it is slow as a sorcery. Swapping it for hard counters is better here. Keep Solitude and Ephemerate in, but remember that while Teferi is out they can only be cast at sorcery speed.