Awesome. Thanks! So, first and foremost - don't waste your time with Nightmare campaign. At some point in the future you can come back to it, but right now it's just a terrible waste of energy. Second, for every one of the champs in the list below - get them to 60, fully book them (unless otherwise noted), and fully ascend them.
Dragon:
IG:
FK:
Spider - NOTE: This team is *far* from ideal. But it's the best you can work with for now, I think
CB:
No Dhuuk for IG? He's supposed to be an IG god
He's not bad by any extent, but I don't know if you need him. Experiment with the lineup I suggested, and if you find that you are having trouble surviving, then you can drop FB for him. The only thing he really brings to the lineup is ATK down, which may or may not be necessary.
May have just heavily upgraded my account and might be able to get to mid game and 20's. Decided to splurge and do the 150 pulls for candraphon and got some absolute gold along the way. Finally some luck ! After i complete helicath, im thinking the order for 60's would be Trunda, candraphon, countess lyx, sepulchre sentinel, then gurgogh, then apoth?