It is winning over and over and over again. Each time the rank score goes up, I battle with a wider variety of people, and I see a lot of new cards.
When I tried to buy more normal cards from the market, I did not have much more normal cards than I expected.
Good cards are hard to buy because they are expensive.
And it looks like there is a character-level system, but I do not know how to raise the level yet.
The more I think about it, the more difficult it is.
I think it is necessary to have an incentive for users who are better than they think, but who do not spend money.