Eldrazi Tron is a slow ramp deck that wants to land Karn, the Great Creator or Chalice of the Void and then overpower us with Thought-Knot Seer and Devourer of Destiny, so disrupting their plan matters more than racing. Ashiok, Dream Render denies their Expedition Map search and can mill/strip their graveyard, but it is a colored permanent, so Ugin, Eye of the Storms or Devourer of Destiny can exile it. Treat it as a good way to blank their Maps rather than a threat they can't answer. Damping Sphere is the main addition: any of their Urza's lands that would tap for two or more mana produces just a single {C} instead, which cuts the mana that powers their big plays. Surgical Extraction is reactive rather than proactive, since it needs a card already in a graveyard to target. Once something like Thought-Knot Seer, Mind Stone or Expedition Map has hit their graveyard, it can exile the remaining copies from their hand and library. Thoughtseize is weaker here since much of their deck is lands, artifacts for mana (Mind Stone, Expedition Map), and big creatures that are hard to discard-strip productively.