This matchup is a race between two combo decks, but Living End has meaningful built-in disruption. Ral, Monsoon Mage costs {2}{U}{R}, which means Mystical Dispute answers it for a single blue mana — an enormous tempo swing that often ends their turn cold. Endurance is your best main-deck disruptive tool: flashing it in at end of their combo turn exiles their graveyard and shuts off Past in Flames, so hold mana open for it rather than cycling recklessly. Post-board, Flare of Denial gives you a free instant counter specifically for their Orim's Chant, which they bring in to stop your cascade spells; prioritize leaving a blue creature available to pitch. Force of Negation handles any other critical spell in their sequence, and your goal is to either land Living End before they can storm off or trade one piece of disruption for their win condition — you rarely need both.