I really dont like the in game market experince. It isn't bad but it could be better. Some points that bug me in the in-game market (there are more ofc):
renting (out/in)- this need a rework and soon. Sometimes I get an unclear amount of DEC out of nowhere, and only when I open the balance sheet do I see that someone has canceled a card I rented from. Even without mentioning which card was canceled and requires replacement.
Card trading- Want to check the prices of a card before you determine the amount you want to get for the card? Good luck, you need to do this in the most cumbersome way possible.
Power-It is not possible to see how much power a card will add to your balance if the card is not in your hand already. It may not be as critical as the other points but it's something I'd expect to see.
Maybe Im the problem and I should learn how to use the other markets... but for me right now the in-game market is pain in the ass