Eldrazi Tron relies on ramp and search effects like Expedition Map and Sowing Mycospawn to assemble its colorless engine, so Ashiok, Dream Render shuts down those searches and mills them as a secondary win condition in a long grindy game. A second Spell Snare hits Talisman of Resilience, and Surgical Extraction can strip the remaining copies of a card like Devourer of Destiny or Sowing Mycospawn from their graveyard, hand, and library once one lands in the graveyard. Jace is too slow and an easy target for the exile triggers of Devourer of Destiny, Ugin, and Ulamog, and the second Prismatic Ending can only exile very cheap permanents. Keep Consign to Memory in, since most of their spells are colorless and it can also counter triggered abilities. Solitude is your primary answer to their giant Eldrazi creatures, since Ulamog is indestructible and cannot be destroyed by sweepers, while Wrath of the Skies can clean up smaller creatures like Sowing Mycospawn. Force of Negation is for Karn, Ugin, and their other noncreature spells.