Skill is Command of the Doom King. Should be better with more Armageddon and Kepler, but I only got one each. Averages in the 5000 assessment range, but I just love shutting down all that effect damage.
Well, the Abyss Ragnaroks can be replaced by any of the strong D/D/D beaters like Zero Maxwell or Apocalypse, and Genghis is more for backup. The core against BA is mainly just Leonidas and King d'Arc (through Swirl Slime or Swamp King). Alexander is just for the bonus assessment, and the rest is to maximize consistency/searchability.