UR Aggro comes out of the gates fast with cheap threats like Scalding Viper, Hired Claw, and Burnout Bashtronaut backed by burn, so your priority is surviving long enough to leverage your mana advantage. Day of Black Sun is your best haymaker here — holding up mana for it can reset their board entirely and swing the game, so plan your turns around casting it as early as possible. Qarsi Revenant provides a resilient blocker that can stabilize your life total against their burn-heavy plan. Duress and Ouroboroid are too slow or mismatched for this matchup — you want reactive removal and board control, not hand disruption or value engines. Keep Llanowar Elves and your acceleration in to outsize them quickly, but be mindful that they can burn out your mana dorks; prioritize getting ahead on board rather than card advantage in the early turns.