Sunwukong lead, lyssandra, deacon, zavia.

looking at your drexthars stats gearing is probably a issue though.

Depending on your speed, you might need to run a somewhat go-second team:

* UDK

* SWK

* Valkyrie

* Scyl

I also see Mortu and Ragash there, but they are only 50 - they're both fantastic in arena, particularly Mortu with UDK. 

You have some strong toons for a go-second defensive tank as long as you have the gear to survive the first hit and then deal out some punishment.  

Black Knight is an awesome defensive support and I use him in G3/G4 3v3.  His A2 is on a two-turn CD when booked, which makes him the best Inc Def buffer in the game.

Black Knight A2 followed by Valk A2 and then any two Defense Nuke/Controllers, such as Visix, Drex, Ragash.

There is also no reason to get fixated on Legos.  Epics are a lot easier to fully-book and for your level of Classic Arena, they are more than powerful enough as long as you have the gear.  If you don't have the gear, then quit worrying about Arena and go grind dungeons for a few months until you have better gear.

Jingle Hunter is a sleeper of an arena star with a 24% speed aura, an A3 Nuke with TM control, and hard-hitting single target A2 with AoE Freeze on Kill.  His A3 hits roughly as hard as Skullcrown A2.  Get the right support around him and he can chew through a lot of teams.     

You have all of the toons for one of my favorite arena defense teams, but you may not have the gear.  I run this team as my defense in G5 Classic a few weeks per month just for fun.  It wins a lot of fights:

i

If you go the Speed-Nuke Route, I would not use Lyssandra as the TM booster.  I would use Seeker or Dazdurk.  They both boost TM and also give you an Inc Atk Buff.  You have a lot of options for the second hitter.  Zavia is fine, but she needs to land her poisons to max out damage.  

I would probably go with Genbo once you get him 60ed & mastered.  He requires no accuracy, hits as hard as a Lego Nuker and comes with Unresistable Buff Decrease (on Crit Hits), which works on Stoneskin, Unkillable, Taunt, Shield........

WuKong in the lead spot for his Speed Aura.  Turn Order:  

Seeker A2 into A1 (or Dazdurk A2)

WuKong A3

Deacon A3 into A2 (or Madame A3)

Genbo A3 into A2