1) I want to make level upgrade item, like card in Clash Royale. Each next upgrade of the item must increase in the value of these "card" and currency. Item "card" is stackable and durable.
How can I make it possible to track the purchase price of the next card level?
Where should I store the table of values for each card level?
Level 1 - 1 card 10 currency
Level 2 - 2 card 20 currency and etc.
This information must be available to the player to view and purchase