There’s two components to buff booster:
- All buffs count for more by buffing attack too.
- You still need to take advantage by doing big damage.
AoE takes advantage better than snipe because large attack buffs on snipers wind up as “overkill” - there’s no point doing OTT damage to single targets… AoE winds up getting opponents much closer to dead than normal, slash and DoT often finishes the job.
Ideally you’ll want to discourage attackers from bringing dispels against you (as much as you actually can).
If a dispeller fits into your team naturally then that’s great, but as with anything on defence the attacker has more control over timing than you do.
So…
BT tank? Could do - he’s pretty sturdy and brings you a big attack buff, with extra on top. You’ve also got enough emblems there for revive to be likely.
JF brings plenty of buffs to the table, and prevents an opponent from dropping your defence without dispelling first (this counts for more than normal considering the extra attack on offer for buffs!). His DoT is largely secondary - if it gets overwritten by Azlar then so be it (it’s more likely to happen the other way around, though).
Drake does damage and blinds attackers, but you might actually be better off putting him out to wing, at fast he can do this… Typically I’d try to get at least one flank as a buffer and what I’m about to suggest will mean you’ll have to move him outwards.
Azlar gives you great damage and really takes advantage of buff booster rules… He does this in either form, but I’d be tempted to stick to non costume.
But he’s still a slow, even with costume bonus you want him firing earlier whilst your buffers are still hopefully on the field… He wants to be a flank, here.
I’d want to get a dark in there… But this is still 5* territory and as good as cRigard is, he’s still not quite at 5* level. You’re also in danger of being too passive through the middle if you bring both Rigard and Boldtusk - you can’t be inviting darks by running Drake but no dark, so we have to get one in there (dark holds lots of dispel and mana control).
If it were me…
Sartana - JF - BT - Azlar - Drake.
Note: Drake on the right rather than left - doesn’t make any difference to Drake or any difference to Sartana, except that Drake takes more advantage of any buffs fired the same turn.
There are other ways you could set it, but I’d think this through first and see if you can see any flaws in my thinking (or things you judge differently!) and see where that takes you 
