Missing sideboard cards? The full 15-card sideboard runs about $61.83.
Buy sideboard on ManapoolConsign to Memory is excellent here, countering colorless spells like Basking Broodscale, Glaring Fleshraker, Devourer of Destiny, and Emrakul, as well as other triggered abilities from their Eldrazi shell. Wrath of the Skies sweeps their small Eldrazi Spawn tokens and Basking Broodscale before it adapts. Goblin Bombardment and the narrow one-for-ones (Ephemerate, Thraben Charm) come out since our own creatures aren't the win condition against a combo-durdle deck; we want to disrupt their engine and race with efficient threats instead.
This is a mirror-ish tempo race where Consign to Memory is mediocre since almost all of their spells (Lightning Bolt, Preordain, Expressive Iteration, Lava Dart, Mutagenic Growth) are colored, not colorless, so it only picks off Mishra's Bauble itself as a colorless spell and Cori-Steel Cutter's Flurry token creation trigger, not the actual colored spells. Given the narrow targets, only bring in a small number and trim Guide of Souls, which is a weaker 1/2 body against their aggressive removal-heavy list. Keep the rest of the build intact since Solitude, Ranger-Captain of Eos, and our own removal suite are already well-positioned to out-tempo them. Prioritize protecting Ragavan and Ocelot Pride and racing on the play.
Rest in Peace is devastating against their Flickerwisp/Phelia/Witch Enchanter blink shell and shuts off Overlord of the Balemurk's mill-and-return engine, though note it also exiles our own graveyard so sequence carefully around our Seasoned Pyromancer flashback and Solitude evoke timing. Wrath of the Skies sweeps their small creatures like Orcish Bowmasters tokens and Phelia before they can generate value. Ephemerate is redundant with their own blink theme working against ours in a topdeck war, and Voice of Victory's tokens die easily to their Fatal Push/removal-heavy plan, so trim both for the anti-blink package. Keep Solitude and Ranger-Captain of Eos as they're premium against their grindy value creatures.