@Willng3 -> Yes, i made a list with the codes of my decks aswell. But that doesn't change that there is a chance you sell the wrong card(s) in the Bazaar. And you can still forget to change your mark.
@Guolin -> Ok, Maybe it will help, i understand it will take alot of space if you save all the decks from all the different players. But what if you save the decks only in the playing sessions when online. For example: When you log in to Elements, you can take your code list from your notepad and copy the codes in your deck slots. It will take you like 10 minutes to add all the decks again. This way you only have to change the UI of the Manage Deck section.
I guess it will take some more space then it does now, but doing it this way saves much space because the server doesn't needs to save all the decks players saved in the deck slots.