Jeskai Control's gameplan hinges on sweepers like Deadly Cover-Up plus reactive removal such as Fire Magic, Sear, and Firebending Lesson, so Dawn's Truce protects the whole board with hexproof (and indestructible if the gift is promised) right when they try to wipe or snipe your threats. Doorkeeper Thrull is a flash flying blocker that dodges sorcery-speed removal and can ambush their small Monk tokens from Jeskai Revelation. Smaug the Magnificent and Twinmaw Stormbrood come out because they're the weakest cards against a deck full of efficient removal rather than creatures to race. The full 24-land base stays intact since this is a grindy matchup where flooding out is still safer than getting land-light against sweepers and Great Hall of the Biblioplex's long-game inevitability.