WBR brings a dense removal suite (Requiting Hex, Erode) and Dawn's Truce protects our board from their targeted removal while pushing through lethal. Doorkeeper Thrull is a fine flash blocker against their aggressive creatures like Marauding Mako and Bloodghast while shutting off enters-the-battlefield value from Casey Jones or Carnage on their side, though its main role here is just a solid body. Burst Lightning is undersized against their 3-toughness threats like Casey Jones and Cecil, Dark Knight, so it comes out. Keep the majority of our proactive mainboard since this is a mirror-style race we want to win with a faster, more resilient clock.