First off, GREAT Game.  I'm really enjoying it.  Keep up the good work.  Below is a very minor bug that I have encountered a few times and thought you might want to be aware of.  

Currently, when you attempt to add a champion to a campaign or dungeon team and they are currently in the sparring pit, the wrong champion is selected for the team and the selected champion is removed from the pit.  

Steps to reproduce:

-Place champion A is sparring pit

-Go to a campaign or dungeon battle team selection screen

-Select Champion A for the team (Champion A currently shows a darkened portrait and a blue check mark over the portrait)

-Choose "Remove"

The team will have a random Champion (most likely not random, but I didn't spend the time to figure it out) added to it.

Champion A is now removed from the Sparring pit and available to be selected for the team

Please let me know if you have any questions