Ashiok, Dream Render's static ability stops any searching from their spells (none of their listed cards search libraries directly, but it still denies future tech), and its -1 mills and exiles their graveyard, which is relevant against Day's Undoing rebuilding their hand and graveyard-based recursion. Surgical Extraction can strip a key copy of Solitude or a Teferi, Time Raveler-enabled card after it resolves once. Flare of Malice is unreliable since Esper Control's biggest permanent is often a planeswalker like Jace, the Mind Sculptor rather than a creature threat we most want gone, making it inconsistent. Keep Thoughtseize and Orcish Bowmasters as our best proactive disruption against their countermagic and card draw plan, since this matchup is won by applying pressure before Supreme Verdict or Wrath of the Skies stabilizes the board.