The shop may look different today. A new way to buy not yet unlocked cards is now live, along with bug fixes, a new earnable currency, and a bunch of new cards.
The new currency is hidden within collector's cache and can be found around 500 levels of the collection ladder. A neat gift of collector's token should have been given to any player at or above that level. You have to check in at least a couple of times a day to see which cards are available. If you don't have the funds to purchase a card, there's a PIN button that will stop the card from rotating out of the shop until you pony up some money.
Several new cards will be added for players in Series 3, as a result of the new shop. Here you can find a complete list of the new cards. I have the power of god, anime, and a buttload of souped-up rocks and squirrel on my side, so I was no match for him. The deck is dependent on cards and can be closed down with a well- placed Shang-Chi.
This week is the last chance to get your hands on the Black Panther card and a ton of exclusive Wakanda-themed card backs and cosmetics. I can taste the reward tier. I wish me luck.