Esper GenericBlink leans on fetchlands and nonbasic duals, so Boseiju, Who Endures is a flexible land that can be played as a land or Channeled from hand to blow up a problematic land or enchantment, making the land-for-land swap free value. Mystical Dispute is cheap and can tax or outright counter their blue spells like Kaito, Bane of Nightmares for just {U}. One copy of Prismatic Ending comes out since their mana value 2 threats like Orcish Bowmasters are already well-handled by Leyline Binding and Teferi, Time Raveler shutting off their flash plays, and High Noon is less impactful against a deck that isn't chaining many cheap spells per turn. Teferi, Time Raveler is excellent here, limiting them to casting spells at sorcery speed, which shuts off their Ephemerate and flash creatures like Solitude, Phelia, Exuberant Shepherd, and Orcish Bowmasters.