last i checked, you get only one kaiser copy every so often (if that cause i don't know if they resupply or not).... so it's gonna be a while before you can MLB one of them. if you're trying to damage spike your team, you should be using lilims and both dragoons in sub slots given the damage increase from buffs should outweigh the stats. but optimized sub slots for that would get filled with kaisers eventually cause they have insane stats with incredible buffs. i'm just saying don't drop the lilims from the sub slots until you need to cause that's a few turns of buffs you could be using.
with all 3 of the buffers that's up to 15% elem atk and 20% elem def for 3 turns from SR dragoons, it says medium for lilim elem atk buff so i'm guessing 20% from that for 3 turns, and then kaiser comes in with up to 50% elem atk and however much elem def for 2 turns. that's 8 turns of at least 15% damage increase until you can start filling the sub slots out with kaiser copies, in which case it'll only grow from there. and bonus points to this strategy if you can add eidolons like fafnir, ifrit, and meng huo into the mix. a free player (that might have rolled a different 100% eidolon) could use all 6 with fafnir as the lead, but someone with say belial could just replace someone else, let belial take the lead, then probably toss the SR dragoon out cause it has the weakest of the buffs. just saying it's a thought.
as for my teams hitting hard, only ones that would come close is fire (and that's if i go buff happy with my kami, which yamaraja needs leveled for), and dark (which needs an ability nuke setup and either my satan or thanatos to go with my amon). light can just debuff and go, especially since my lineup has Sol, Raphael, Tsukiyomi, Diana, Shamash, and Metatron, so I can set them how I need. if debuffs won't stick so well, then fire is my best damage output hands down. that said, i kinda dropped wind as my secondary (but still use them) and moved fire to it cause my grid for light is more or less set, i just need to level everything.
in fact, that light grid is here: