The crystal tower this month was a challenge for me to clear with the full CM using four unique teams, mostly due to my lack of haste/boost relics outside of Ramza and Onion. The four teams I used for the event was:
Diamond Weapon -- Maria, Vaan, Raines, Onion, Yshtola
Mateus -- Orlandeau, Agrias, Mustadio, Ramza, Ovelia
Barbariccia -- Kain, Cecil, Minfilia, Edward, Ceodore
Yojimbo -- Auron, Tidus, Basch, Rikku, Yuna
Video of my full clear:
Crystal Tower #2 Full CM
Diamond Weapon was probably the easiest because I brought mostly A team members and he's nothing but a dps race.
Mateus was rough, probably due to the team I built. I should have gone with some legend dived dps instead of worrying so much about synergy and bringing crappy characters like my lvl 80 Mustadio. Worked out alright though with Unicorn magicite to blink some statuses.
Barbariccia wasn't really hard, but the fight dragged on forever, once again probably because I was too focused on synergy instead of bringing my primary legend dived units. I had to use Edward's mage shout (with no mages on the team) and Minfilia's ATK boost just to get buffs up, but both of those characters were kind of worthless after using their buffs.
Yojimbo was about average difficulty. Once again I had to do a ghetto buff setup with Yuna USB for haste and Basch atk/def soulbreak for stat boosting, but thankfully I have a water chain, so once the chain was activated the boss died fast.
Overall I enjoyed the crystal tower because it was a real challenge to beat, something the game's been lacking recently.