Jeskai Control has few early creatures worth killing with Erode or Seam Rip, so trim those cheap answers for more impactful cards against their grindy plan. The extra Captain Marvel, Earth's Protector is a flash flying lifelink threat that dodges sorcery-speed removal like Day of Judgment and can close games once they run out of answers. Ultima is a full reset that answers their Great Hall of the Biblioplex once it becomes a creature and any artifacts/creatures they've resolved, while also ending the turn to blank their reactive spells. Keep your counterspell suite (Countersculpt, No More Lies, Three Steps Ahead) to fight through Jeskai Revelation and Stock Up value.