-UPDATE 1- Now, if you don't want to sell a card, you can go back and sell it later. You can decrease the cost of a card pack through a new upgrade in the shop. Debuffed the sell price of the rare card down to $100. Resized the cards and the pack to be the same sizes. Click the 'open pack button' once you buy your pack. Go to the shop to buy packs and to get money, sell your cards.
All pack and card images to Upper Deck/Tim Horton's. Any suggestions? Tell me in the comments!