Id probably aim for something like lead felneus/sgx/raydn/zellha/sefia, thats a pretty decent bb spam team, just lacking an atk buffer like michele, who if you draw can replace sefia. Themis and oulu(copra) will be useful if you need a more defensive team.
Felneus - really solid bb spam leader with bc buff - good until you get a uda/zelnite etc, deemo is also an option in leader or as a friend
SGX - best crit buff 60% in game, ,dark buff-makes all atks at least neutral. Crit buff is one of the best buffs you can have.
Raydn - best spark buff in game (70% spark) - and def ignore thrown in. Sparks a key buff.
Zellha- your best attacker - lots of hits on sbb, dont lose out too much not having a luther as raydn has a better spark buff (luther is 50% spark) anyway.
Sefia - Shes still good damage and stats but slightly outclassed by the newer stuff, but shes probs your second best damager. she's the first one to drop for healer/element buffer etc.
All together this squad will have the best crit buff(60%) the best spark buff(70%) def ignore (nice to have but not essential for most things) a bc buff+bc gen lead, dark elemental buff to turn attacks at least neutral and 2 solid attackers to make the most of it. The only other buff you would need is a attack buff like michele to make it a really top tier team.
For utility you'll probably want these as well:
Oulu(copra) - essential for some high level stuff for the 50% damage mit buff, Darvenshel is the only real other option if you draw it(hes better)
Themis- Your best healer
Various elemental buffers are useful to have but the dark element is usually good enough as you always hit neutral at least.
Ronel for the status null is nice to have around too. For most stuff you dont need a status null though as you kill stuff too quick to make much of a difference.
SGX is really bad leader for anything but metal parade as def ignore is one of the worst buffs, and 25%atk is negligible.
