I have another question that is similar. Can you possibly use the shop to buy cards or decks? I don't like how you get the cards now at all. I would love to see a menu basically in the shop that shows each card and how much it is and/or how rare it is. I like the random cards feature though and would like that to see that stay.
Also, is it possible for you to get an achievement for a getting a particular card in your deck? For example, i have a harder to find card and if someone got it, they would automatically be assigned an achievement.