Missing sideboard cards? The full 15-card sideboard runs about $31.03.
Buy sideboard on ManapoolMono-Green Eldrazi wants to ramp into Emrakul and Devourer of Destiny off Eldrazi Temple and Ugin's Labyrinth while digging with Ancient Stirrings and Malevolent Rumble. Damping Sphere only matters when a land is tapped for two or more mana, which makes Eldrazi Temple's {C}{C} and an imprinted Ugin's Labyrinth produce a single {C} instead. It does nothing to Urza's Saga, which taps for one {C}. Its spell tax hits both players, so it also slows our own multi-spell turns. Surgical Extraction can strip a key Ancient Stirrings or Malevolent Rumble copy after it hits the yard, disrupting their card selection engine, and Ashiok, Dream Render stops their spells and abilities from searching their library, which shuts off Urza's Saga chapter III and the land search on Sowing Mycospawn. Force of Despair and Witherbloom Charm are weak since their threats aren't cheap enough or don't die to a sweeper that only hits creatures entering that turn; our removal suite (Fatal Push, Fell the Profane, March of Wretched Sorrow) already handles their smaller threats.
Rakdos Delirium relies heavily on self-mill and graveyard synergy via Stitcher's Supplier, Street Wraith, and Nethergoyf's escape, plus delirium payoffs on Fear of Missing Out and Detective's Phoenix's bestow. Surgical Extraction can strip a key Stitcher's Supplier or Nethergoyf out of their deck entirely once one hits the graveyard, denying both the escape engine and delirium count. Damping Sphere slows their ability to chain multiple cheap spells in a turn, blunting their low curve aggression. Force of Despair whiffs on creatures already resolved from prior turns and Witherbloom Charm's destroy mode is too narrow against their curve topping out higher than mana value 2, so both come out for more targeted graveyard disruption.
Esper Control leans on Solitude, Orim's Chant, Narset, and Teferi to disrupt and control the board rather than flooding it with creatures. That makes Fatal Push and Force of Despair much weaker, since they have very few creature targets. Their main creature, Solitude, costs five mana, so Fatal Push can't reach it. We keep Fell the Profane because it also destroys Narset, Teferi, and Jace. Inquisition of Kozilek is a cheap sorcery-speed discard spell that adds to our Thoughtseize count. It can take Narset, Teferi, Orim's Chant, Silence, or another cheap piece before they deploy their plan, though it can't take Solitude or Supreme Verdict. Ashiok, Dream Render shuts off their fetchland searching and can mill four cards and exile their graveyard. It also sidesteps Solitude and their sweepers, so they have to spend a dedicated answer such as Sink into Stupor to remove it. Thoughtseize remains crucial for stripping their disruption before they can establish control.