Why do you need to use one team for CoF? Whole point of challenge to change heroes, adapt teams, manage energy (storing early, correctly use after), hire missing heroes.
I believe CoF should be stronger and more rewarding at the end, so people really learn to use tactics rather than one super duper team.
Exactly. I would rather have a difficult CoF with better rewards. Something like, you can't use the same heroe more than 5 times or having limited ultimates of each heroe for the whole run. Obviously the difficulty will be increasing because at first would be crazy for someone with blue and few heroes.
But it is so boring to do CoF, and to get only white items and once a month a good item. Heroes haven't gotten anyone good there and only like 3 in total and useless.