Rest in Peace is a devastating answer to Living End since it exiles creature cards from their graveyard the moment it resolves, stopping the suspended Living End from having anything to reanimate, and continues to exile future discards from Street Wraith or cascade triggers. Surgical Extraction can proactively strip a Living End from hand, graveyard, or library to deny them their combo piece entirely. High Noon does restrict them to one spell per turn, which would stop a cascaded spell from Violent Outburst or Shardless Agent from being cast, but it does nothing to stop the suspended Living End trigger itself, so it isn't worth the slot here, and Avengers Disassembled's 3-damage mode dies to nothing relevant while their manabase is fetch-heavy enough that land destruction is low-impact. Keep Solitude and Path to Exile as efficient instant-speed removal for anything that resolves.