Hey guys!

I am in desperate help in improving my clan boss team, currently I hit NM for 3 keys or 4 for force affinity (which sucks), I'll attach a photo of my line up below. For the past weeks I've pulled Sir Nicholas, Demytha, Pain Keeper, and War Caster and was wondering if it was possible for me to build an unkillable team with it. 

If not, then which champions should I replace my current line up with? I'm definitely looking to swap out FB with Kael, and replacing Coffin Smasher with Grush the mangler for his leech A1(So I can play around with gears not having to depend on lifesteal gear) and A2 decrease ATK but i'm not sure if it is a wise decision 

Cheers everybody!

i

Side note:

I sometimes switch in Santa for the lead and not sandlashed and the damage output is about the same;

who do you think should be the lead?

i