Missing sideboard cards? The full 15-card sideboard runs about $79.57.
Buy sideboard on ManapoolEldrazi leans on artifacts and Urza's Saga (an enchantment land), so Force of Vigor has real targets. It can destroy up to two of Urza's Saga, Blade of the Bloodchief, Haywire Mite, Springleaf Drum, Talisman of Resilience, Soul-Guide Lantern or Vexing Bauble in one card. It can't hit Ugin's Labyrinth or their other lands, which are neither artifacts nor enchantments. Masked Vandal is a one-shot answer: when it enters, you may exile a creature card from your graveyard to exile an artifact or enchantment such as Urza's Saga or Blade of the Bloodchief. Witherbloom Charm is flexible. Use its destroy mode on a nonland permanent with mana value 2 or less, like Springleaf Drum, Vexing Bauble, Blade of the Bloodchief or Basking Broodscale. Its sacrifice mode only draws you cards and removes nothing from their side. Young Wolf and Carrion Feeder are weak here: they are small, Carrion Feeder can't block, and the Eldrazi have much bigger bodies, so they come out. Keep your sacrifice engine intact, since Kozilek's Command and Emrakul are the real threats to race around.
Endurance can be evoked by exiling a green card from your hand to put the opponent's graveyard on the bottom of their library. That is strong against a deck relying on Nethergoyf, Moonshadow, and escape/delirium synergies, but an evoked Endurance is sacrificed as it enters, so it costs you two cards. Hard-cast for {1}{G}{G} at flash speed, it instead stays as a 3/4 reach blocker. Thoughtseize strips their Flare of Malice, which can take out Yawgmoth, or a Lightning Bolt before it picks off smaller key pieces like Ajani. Young Wolf is a small body that does little in this matchup, since Flare of Malice sacrifices the creature with the greatest mana value and Bolt only gets a 1/1 that undying brings back, and Explosive Prodigy's small body doesn't trade well, so both get cut. Sequence Endurance to reset their graveyard after they've committed cards like Stitcher's Supplier and Detective's Phoenix for maximum value.
Thoughtseize lets you strip Solitude, Teferi, Time Raveler, or a sweeper before they can disrupt your plan, which is crucial against a deck full of answers. Gaddock Teeg shuts off Supreme Verdict (mana value 4) and Wrath of the Skies (it has {X} in its cost) while your creatures keep functioning, though note it does not stop Solitude, Narset, or Day's Undoing, which are a creature, a mana value 3 planeswalker, and a mana value 3 sorcery with no {X}. Young Wolf and Explosive Prodigy are too fragile and low-impact against a grindy control deck with efficient removal and card advantage. Play around Orim's Chant and Silence by not overcommitting mana to one turn when possible.