Wow, that's a great roster... you have a number of good options, but could try something like Uugo, Zavia, Fahrakin, Brago and Aox? You'll want to find the right balance between poison damage, survivability (decrease attack debuff, increase def, healing) and other offense (the ally attack, warmaster procs, decrease defense debuff). 

I think I'd take

Bulwark, Iron Brago, Frozen Banshee, Aox, Uugo

Thanks