Notes & Combos
There are obvious downsides like the extra deck being really tight and deck size. I also didn't play Maxx C (I just never use it) but you definitely should play 3, play 3 Diabellstar, 2 Poplar, Crossout and Nibiru aiming for 60. You can consider playing 2 Flamberge for the early Divine Temple but you don't really need it and there are enough bricks in the deck. The idea is to have the snake eyes for I:P+Borrelend lines but there are some synergies like using field spells as fodder for snake eye stuff and Flamberge being a dragon so you can either send it with Ravine or link it off for Seals or Romulus (ideally not).\ You can basically play the deck like either Snake Eye or DLink and follow up with the other engine; with the exception that some lines will require you to pop with Striker Dragon before being able to Pisty. Apo lines can be Nibiru safe with enough extenders but you can do Seals lines too. By being greedy, you can get your Rokket lines and then use Ravine as fodder for Snake Eye stuff or use Snake Eye stuff as fodder that you later reborn with Promethean. This will allow you to go into Promethean Princess and I:P and still have space for Borrelend. Be flexible with your resources, there are many wacky lines that allo you to use Tracer, Striker or Snake Eyes to benefit from the extra cards face up on the field from the other engine. With the Bystial stuff you can recycle your Striker Dragon for follow up and Etude of the Branded is unironically decent allowing you to Baronne or Dis Pater in the opponent's turn but more importantly, it is more or less a floodgate because Rescue Ace and Snake Eye need their stuff in the GY. Unchained and Branded are also affected and they generally will have a harder time outing it without going really negative.