I've got all my 7-stars max UBB'd - I've actually been throwing away a lot of fodder lately just because it ends up being -50,000 zel (not that zel matters much) every single combine and most result in no gains....you can flush a scary amount of gold just doing that. Mostly I don't mind it, but every now and then I take a little break and watch Millions start to pile up again.
edit: Oooh, and what are people using for Arena teams?
I'm actually pretty happy with my Arena team atm. I hit the 500 Consecutive Wins mark just before the infamous "patch" that had us down for days....I was going to post a screenshot but I was in no mood for it at the time heh. If I ever pass the 750 and 1,000 consecutive wins personal milestones, I'll post a screenshot then just so folks know I am not talking out of my ass. I just hit 653 Consecutive Wins.
I use:
Slot 1: Sefia (42 Dropcheck on Normal Attack, Slot 1 due to Arena AI typing)
Slot 2: Quaid (LEADER: +Attack +BC Fill, -BC Cost to group)
Slot 3: Griel (33 Dropcheck - not amazing, but still quite good, also max imp'd and a very solid unit....weakest of the 5 on my Arena team)
Slot 4: Selena (72 Dropcheck on Normal Attack with Lexida, still an Arena God)
Slot 5: Kikuri (48 Dropcheck on Normal Attack, Slot 5 due to Arena AI typing)
Zenia makes a strong case with a monstrous 78 Dropcheck on Normal Attack with her Extra Skill active, but she only attacks a single target on her Brave Burst - and even though it is actually rare to see my units only have a Brave Burst (special conditions: Empty BB Bar, and No Leader Skills can sometimes keep me short of a full 5 SBB's filled after the first turn), on the Risk vs Reward, she'd have to replace Kikuri (As both are Dark units and this is a Rainbow team).
Any units that have very high Dropcheck and are Arena AI types 1-4 are nice to have around (with Arena AI type 3's being the best, but types 1,2 and 4 are still very usable, they just dictate order you need to use them in the group.)
A leadership skill that boosts ATK and improve BC Fill in some way are excellent. ATK to help with 1-turn Kills and BC/BB fill to get those bars up after the very first round.
Right now my group is performing well enough that I don't worry myself with random conditions. No Brave Bursts? I'll *still* probably wipe out my competition on Turn 2 just from regular attacks. No Leadership skills or ATK parameter halved? Probably won't fill all 5 SBB's or get as many kills on the first round, but 5 BB's is still a given.....still wipe out the competition on turn 2.
The ONLY random condition that is a little spooky is getting badly screwed by RNGesus on "Status Effects Active" and having like 4 of 5 start out the fight paralyzed. But I don't know of any group that could really overcome that. Short of that, nothing is stopping this train. I've got a ways to go, but I'm starting to get closer to getting some of the good mid-rank Arena spheres.
If you have a Michele sitting around, once she gets her 7-star, she is going to completely de-throne Quaid as my go-to Arena Leader.
If you want to boil down Arena team building to two simple elements, it is this: Find the character on your roster with the best Arena oriented Leadership skill. Then find the best 4 characters to sub that have High Dropcheck (as high as possible, Double normal hitcount extra skills/spheres etc can be huge for this.), and make sure they are of usable Arena AI typing. Then you just need to put them in the right order.
Sol Creators (or better) are freakin' excellent as secondary spheres in the Arena, because they go very well with High Dropcheck attacks anyway, and filling BB/SBB bars are still the best ticket to a 2nd turn win. Primary spheres are a longer discussion, but mostly because some are really only most useful in the Arena, whereas others are more universal and if you are using characters both in the Arena and regular group, then you won't want to be switching spheres constantly. 3 of the 5 on my team use their Unique spheres anyway, so that takes a lot of thinking out of it....the other 2 I just use Malice Jewels or somesuch because I use those characters elsewhere...and frankly my group steamrolls hard enough that I don't have to tweak anything else out of it atm.