Mardu Energy floods the board quickly with Ragavan, Nimble Pilferer, Guide of Souls, and Ocelot Pride, generating tokens and energy before you can land your haymakers, so early interaction is critical. Trinisphere is your best tool here — it taxes all of their cheap spells and dramatically slows their curve, buying you the time to ramp into game-ending threats. Unholy Heat handles Ragavan and Guide of Souls cleanly and becomes especially powerful once delirium is online, killing nearly any threat they present. Kozilek's Return stays in because it sweeps most of their board at instant speed, including tokens produced by Ocelot Pride and Goblin Bombardment sacrifice fodder. Trim one copy each of World Breaker and Ugin, Eye of the Storms to streamline your curve, since a single resolved Emrakul, the Promised End is more than enough to close the game once Trinisphere has slowed their aggression.