Assisted fire teams can already wreck house, just not as strong as thunder or water.
My old frontline before I pulled any legends was Pyrokaizer, Ouroburn, Moltagant, Clioseraph
5th: Volcamus
6th: Random Stunbomber
7th: Flamechimera (<- specifically not ultra-evolved, he is by far the hardest hitting bloodcraver. 3990 atk as 4.5 star)
8th: Emberzard
and at that point, ouroburn was usually dead. Also, I’d vouch for never evolving flamechimera until at least there is nothing else to fit in your team that is cost-restrictive. And even then it’s still questionnable, as most 4.5 blood cravers are 3700-3850 atk, while it outclasses at 4k. The ultraevo’d forms are usually around 4300-4450 range. The main argument here is that the extra HP + atk might mean you can get an extra bloodcrave in sometimes due to taking less damage, killing faster and having more bulk. But he also becomes a duck for sleep killer. I use flamechimera a lot because he doesn’t need as much protection except against knockbackers, leaving an extra slot for damage or other utility (give turners).
Now if I chose to run this team again, it’s not viable in PvP if that is your goal without lavaronix.
Pyrokazier, Ouroburn, Lavaronix, Moltagant (just to block sleep killer + sleep bomb)
5th: Blitzdragon
6th: Flamechimera
7th: Clioseraph/Serapheon
8th: Another blood craver (preferably dinoraider, snowninja is countered too often by thunder)
9th: Volcamus (At this point, Ouruburn usually dies).
Make sure you stick alphagear in there somewhere, or if you want to be a massive dck, replace moltagant with alphagear