Esper Control is full of cheap interaction and countermagic (Spell Snare, Force of Negation, Teferi, Time Raveler), so Trinisphere taxes their one and two mana answers while your threats are naturally expensive and unaffected. Cavern of Souls lets your Eldrazi creatures dodge their countermagic, and Thought-Knot Seer strips a key answer like Wrath of the Skies or Solitude on resolution. Boseiju, Who Endures comes out since it is a dead draw against their land base of mostly basics and duals; Gemstone Caverns is cut for the extra colorless-producing Cavern since this is a grindy game where consistent mana matters more than a speculative free land, and Vexing Bauble and Talisman trim down since neither interacts well with their removal-heavy, low-free-spell gameplan.