Esper Blink leans on Flickerwisp, Ephemerate, and Phelia, Exuberant Shepherd loops along with Solitude for free interaction, so a proactive, resilient gameplan beats trying to remove their value creatures one at a time. Grafdigger's Cage keeps Emperor of Bones and Boggart Trawler recursion off the table while doing nothing to hurt your own plan. Warping Wail is versatile removal for their small blockers or a way to make a blocker of your own, and Six adds card advantage and a durable, hard-to-kill (reach) body that also helps rebuild after Wrath of the Skies. Unholy Heat comes out because most of their key threats (Solitude at 3/2 dies to it, but many others like Overlord of the Balemurk at 5/5 or Atraxa-adjacent bodies do not, and delirium is slower here) are less reliably answered than by your existing removal suite; Haywire Mite is a low-impact card against a deck without many key artifacts/enchantments to target.