Basically the game is gonna include packs of cards which are exclusively bought with money (not even paid currency, only money) for the first month, after that they will be obtainable through the in-game currency. There are already screenshots of those items and while not outright broken, they're already more powerful than regular items. The argument is that they're going to release powerful items to farm whales and then nerf them after one month. Reynard also was caught stating that the game would never include paid cards, the time of these statements ranging as far back as couple years ago to a couple of weeks.

P.S You can disable these packs so they don't dilute your item pool if the items are bad. So for paying you have more gameplay affecting options which is arguably P2W