Living End is a combo deck whose namesake spell and Violent Outburst's cascade trigger, along with Force of Negation's alternate cost, can all be disrupted by countering the eventual Living End cast with Consign to Memory only if it's colorless — it is not, so instead the real value here is countering triggered abilities like the ETB from Endurance or Subtlety when they flash in; the colorless artifact-independent parts of their plan is limited, so the more relevant plan is using Thoughtseize preemptively to strip the suspended Living End or Force of Negation before they can protect the combo. Mystical Dispute is a serviceable cheap counter against Subtlety, a blue creature, getting the discount, though it costs full price against the green Endurance. Quantum Riddler and a copy of Emperor of Bones are too slow and don't interact with a deck that can flip its entire board on turn 3-4, so trim them for the extra interaction. Keep Solitude, Fatal Push, and Prismatic Ending in, since answering their reanimated creatures after Living End resolves is still important.