Wow so much stuff coming down the pipeline. Need more free stones! Can't keep up with all this stuff.
Anyway, Takaoka City Collab looked pretty simple so I decided to take my infinite loop Kushi team for a test run. It worked beautifully.
Kushinada
Echidna
Echidna
Echidna
Blodin
Kushinada
All max-skilled except for Blodin. He's just there for stats, skill boosts, and a source of Water damage. Once Kushinada and Echidnas are active, you're able to do an infinite delay+armor loop. Every 3 turns right before delay wears off, activate Kushi to reduce damage between delays. Then delay with the next Echidna. Continue ad infinitum, alternating Echidnas and Kushis. Of course if you get a big enough combo, Kushi will OHKO anything anyway, but this is super safe, in case you just can't get big enough combos or if you're in a regular 6 color dungeon.