BRG floods the board with cheap sacrifice-synergy creatures like Callous Inspector, Gene Pollinator, and Greedy Freebooter, so Day of Black Sun sweeps their early board cheaply while your bigger threats survive. Duress strips a key piece like Obsessive Pursuit or Requiting Hex before it can develop, and Deep-Cavern Bat provides an extra lifelink flying blocker while stripping their hand. Cut the narrow Rapid Rescue and Wistfulness, which are too slow against this aggressive sacrifice shell, along with both Awaken the Honored Dead copies and a Bitter Triumph since their creatures are individually low-impact and don't always justify a premium removal spell.