Just a little suggestion tweak to make things a little more convenient.
Add an upgrade card button to the manage deck/bazaar screen. It would only appear once you have the option to upgrade teh card, but it would be nice to save the time from opening up the manage deck, removing the card from the deck, switching to the main screen, clicking quests, choosing upgrade card, choose the card, go back to the main screen, clicking manage deck, and putting the card back in the deck.
