Champions level up per battle

Vollmondum

As an idea: level up the champion a little each time a fight is won with.
That would solve constant lack of iso/gold and add some usefulness to those champs you don't want to spend on, but can play.

Giuliameij

What lack of iso and gold? If you use your resources correctly you can always have 1k+ iso bricks and multiple millions of gold whenever you need it.