Mono-Red Aggro wants to race you with cheap efficient threats and reach from burn spells like Burst Lightning and Shock, so life total management matters; Vicious Rivalry's life payment is too risky here. Ygra, Eater of All is a sturdy 6/6 that stabilizes the board and survives most of their burn suite, turning the corner against their aggressive plan. Mai, Scornful Striker provides an early first-striking blocker that punishes their burn spells, while Day of Black Sun serves as a board wipe against their low-curve threats; keep your removal suite (Bitter Triumph, Maelstrom Pulse, Assassin's Trophy, Shoot the Sheriff) intact to answer their dragons and hasty threats. Stab and Witherbloom Charm are too small to reliably answer their bigger threats like Nova Hellkite or Smaug the Magnificent, so trim them for more resilient plays.