Mardu Energy is a hyper-aggressive deck that floods the board with Ragavan, Ocelot Pride tokens, and Guide of Souls triggers, threatening to kill you before you can assemble the reanimator line or establish the Psychic Frog / Solitude engine. Goblin Bombardment is their most disruptive card — they'll sacrifice creatures in response to Solitude's evoke trigger to fizzle it, so hold Teferi, Time Raveler to bounce the Bombardment before you evoke. Wrath of the Skies and Supreme Verdict are your reset buttons; prioritize deploying them when the board is wide and their Bombardment is not yet online. Atraxa is your best reanimation target here, as her lifelink and four-card draw swing the life total and card advantage dramatically in your favor. Post-sideboard, be aware that they bring in Thoughtseize and Nihil Spellbomb to attack your graveyard setup, so try to assemble your combo pieces quickly before they can strip the key elements.