Assuming that epic books are much easier to come by for you than lego books:  Gorgorab, Stag Knight, Pan & Fenax ought to get some good work done for you.  

If you can afford to book a lego, then Alice would be an excellent arena damage dealer for you. 

If you find that using two nukers has you dying too often, then you need more support or control.  Good choices are Miscreated Monster, Mausoleum Mage & Rector Drath, all of whom will help you advance in various parts of the game.  Miscreated Monster especially for Spider progression.    

All that said, it is far better to focus on Clan Boss & Dungeons (over arena) if you are still relatively early game.

Following to see if previous poster  a bot.  Sure seems like it. 

i

yeppers

Thank ya.  Figured as such.