Jeskai Control has almost no early creatures to remove, so Deadly Precision is largely a dead card against their control plan, and while Rottenmouth Viper is a 6/6 creature that causes opponents to lose life, sacrifice nonland permanents, or discard cards rather than an early removal spell, it is cut here, while Strategic Betrayal (exiling a creature and their graveyard) is mostly for graveyard hate against Flashback targeting Jeskai Revelation rather than creature removal, so it's a marginal add here. Duress is the priority pickup, stripping their sweepers (Deadly Cover-Up), removal (Inevitable Defeat), or countermagic (Dispelling Exhale) before you commit threats. Focus games on applying pressure with your cheap creatures before Great Hall of the Biblioplex and Jeskai Revelation take over the late game, and use Duress to clear the way for your key threats.