It would be more interesting if you could change your "Hero challenge" a little bit.
You can by category or levels.
Start with "common hero" after "rare hero", "Epic hero", "legendary hero" etc.
Because of the evolution of heroes, common hero and rare hero are useless. I don't get near wherei can play with them.
Everyone starts with "legendary hero"
If the battle starts with "common hero" the next all of the scores to play with "rare hero" if the heroes are unable to reach that score so you can't move on, it gets harder. In this way, it forces you to evolve your heroes. So let's consume more time and money. 😁