Yeah, no kidding, pretty sweet list there... 

A typical arena combo would be Battlesage for speed aura, debuff removal and increase attack, Tayrel for decrease enemy defense, Kael or Lua to drop massive AOE DPS, and then perhaps Sepulcher or Skartorsis for some other support plus extra DPS. Or both Kael and Lua. Of course, that requires high enough speed to make it work and if you don't devastate the enemy team in the first round, the team might not last long in a drawn-out fight. 

Personally I use my Infernal Baroness as one of the key pieces in my arena team, but that's largely because it's one of the first champions I developed and I'm not sure she's necessarily viable in the longer run. I might end up replacing her by Tayrel or some other def-based champion. Still, she's far from bad, usually my last man standing (or last demon floating, I guess I should say...). Although she really has to be played manually for any challenging fights, because the AI will use her perfect veil whenever it comes off cooldown, whether or not it serves any purpose, and always on the champion in the leader slot even if others have more need of it. 

I have Skartorsis on my second account fully booked and mastered as he was my first Lego (he and Draco are my only Lego). That guy is literally on my every dungeon team comp as leader. His 33% speed aura in dungeons is just BIG. Not to mention his ATK and CR buffs with low CD, clean/turn meter/heal A3 and AoE A1, good damage modifiers, good base stats and overall survivability. He can be realy good support, tank or whatever you choose to build him if you have clear idea how and where you will use him. Obviously, not so effective on CB and sometime that AoE A1 may not be the right choice for IG.

Since your question is about Arena - yes, i use him in Arena too, all the way from bronze to G4 as he is important part of my Arena set up. But you should consider some thing if you plan to build him.

On Arena he can work well with Lua - his ATK and CR buffs can give you enough room to build her for some serious yellow numbers without need to go full 100% CR on her. And because she is a Void, she can't do weak hits, so the obvious path is to stack ATK and CD and around 70% CR (and ACC if you want that turn meter reduction). If someone like Tayrel puts AoE Decrease Defense on enemy before her, things will start to get serious. But if you are not first you most likely will lose....

Your Battlesage may play that role for Arena Leader for speed aura, but there are way better choice for there. Without turn metter booster you will have hard time to win that "speed battle" Are you sure those are the only champions you have? There may be some hidden gems in your Vault that you may overlooked.

Tayrel, Baroness and Sentinel may work on paper for some sort of defense oriented team, but not likely the one that will rely on sustain and survivability. More likely the one that is defense damage based. But probably neither of that will work in game. You can't get neither enough damage nor enough sustain to really rely on that.

I am still interested to see your roster. You may have some good champs there. Also.... your farming probably gives you real pain. You should understand that farming is big part of the game and not having good farmer is now wise choice. Maybe your next 6* should be someone that can do that job well?

*edit - @L9753 is just faster than me, :)  but i see we share similar ideas here

Here is full roster

Arena, like it or not, is important part of the game. You may not enjoy it, but you should do it to full extend - spend your all available daily tokens to as good win ratio as you can and aiming for G4.

Every next Arena tier gives you better bonuses to your stats, which affects every aspect of the game, not just Arena.

Great Hall upgrades can gives you huge boost to your stats and there are couple progress missions that are tied to Arena progress. 

Overall, you should progress as much as you can on every possible content (just don't botter with Faction Wars yet). Leaving some content behind my result in some nasty progress wall that may cripple your advancement. 

ryanharris1507 said:

Thanks so out of my list above. What would be most optimal arena team to develop. 

For Arena offense, it's good to have a number of options so you can adjust depending on who you attack. E.g. if your opponent doesn't have a speed aura lead, then perhaps you don't need one either and can put somebody with another aura in the lead, like Tayrel. Or if your opponent has all four champions from the same affinity, then maybe you should use more champions of the affinity which is strong against that, and less of the one that's weak. So I don't think you should just develop four champions for the arena and then use that team for all fights. 

Among the champions you have that weren't discussed already, I would mention Zargala as a very strong DPS champion, and Jinglehunter and High Khatun as speed leads who could replace Battlesage. High Khatun has a turn meter/speed buff on top of her speed aura, though her downside is that she doesn't offer much else in my opinion. Which one of those three speed leads is the best depends on the opponent, on their gear, on how the rest of your team functions etc. Also, Crimson Helm looks like she can be a strong tank with that Provoke plus Block Damage, for battles in which you need more durability instead of the pure speed nuking approach. Jizoh could also be useful in such slower battles.