I don't plan on playing adventure ever. I trade all my adventure cards to my team. The game encourages you to do that because it's the whole part of joining a team. But now everyone is left a bunch of upgrade items we will never use.

I would like to see a separate trading store (house) where you can exchange upgrade items for other upgrade items of the same rarity. It would be nice if it was a 2:1 exchange but it would probably end up something dumb like 10:1.....

Easier solution would be to add them into the team exchange but I think you should be able to ask for a character and an upgrade item per turn. Either way, can we get something to get rid of unwanted upgrade items?