Esper Control leans on Wrath of the Skies and Supreme Verdict to reset the board, so Exhibition Tidecaller is a low-value creature that dies to sweepers and comes out. Consign to Memory counters colorless spells and triggered abilities for cheap, useful against things like the Isochron Scepter artifact itself. Ashiok, Dream Render shuts off their four Arid Mesa and four Scalding Tarn fetchlands while milling 4 and exiling their graveyard each turn, applying real pressure they must answer. Surgical Extraction has weak targets since Esper Control isn't graveyard-based, so it comes out in favor of more proactive disruption.