Tatsugiri is a cute little guy, and being able to play Garchomp as the sole Stage 2 is really nice. Koraidon is interesting - the attack doesn't feel great (though I've not played against something like a Zamazenta with the deck yet), but 140 HP is really nice to have. Raging Bolt could be another strong candidate for Koraidon's spot.
Recent Changes:
Trying out N's Reshiram, N's PP Up, and Wishful Baton over the Haxorus line - we'll see
Hex Maniac in the Enhanced Hammer/Red Card slot - not sure which disruption type I value more tbh
Luminous Energy instead of Rainbow Energy to take better advantage of higher HP, especially on Haxorus and Garchomp
Raging Bolt to pick off smaller Basic Pokémon, mostly with DDE, with the bonus of adding to Koraidon's Primordial Beatdown