Hello, i'd like some input on which champion I should 6 star next. Currently my clan boss roster is; Aothar, Apothecary, Steelskull, Tomb Lord, and Tayrel. My Arena team right now is silver in rating and I usually run Apoth, Tayrel, Bellower, and Tomb lord. Tayrel and Bellower are 6*. I think my best candidates are as follows;

Apothecary

Steelskull  

Tomb Lord

Frozen Banshee

Rearguard Sgt. 

Additionally, i'd like some input on what combination of these champions would make for the best clan boss team. Apoth, Steelskull, Tayrel, Aothar, Tomb Lord, Frozen Banshee, and Rearguard Sgt. 

Thanks for your time everyone, I appreciate it! =)