Gems can be purchased, but they can also be earned by winning Ranked Duels, completing Missions, and leveling up the Duel Pass, which makes it easy for players to avoid spending money on in-game currency
If you have more Prize cards remaining than your opponent, the attacks of the Pokmon this card is attached to cost [C] less
Card Scanner Use your camera to scan your Pokmon cards, check if you already own them, and add them to your collection in an instant * Custom binders Create your own card binders, choose the format, cards from different regions, plan your next acquisitions and share them with your friends.* Card prices and history Check the current price of each card and track how it changes over time
And from what Rosewater writes, something like that was on the table in the early steps of designing MKM