Thanks for talking about the coins one can earn by playing, the yearly tournament would bring a sense of competition considering the fact that people wouldn't just want to put up their cards for rentals alone but they'll have to play because the tournament would make people want to play rather than just having the game alone for passive Income.
Talking about the in-game cards were even thrilling for me, for one, I felt every bronze card would be a common card or so, but since a card can be bronze and still rare makes it even better. Of course a gold card would always be rare and maybe legendary, I was somehow thinking that one needs to understand the technical jargon behind the cards to svtuat Understand how to utilise them, either for playing or renting dem out.

The passive aspect of equally as attractive as the gaming aspect and I like the fact that the game itself would provide for all aspect of players, both new and existing.

@edicted's post pretty much asks questions based on some of the viable concerns, but it was even better to get enough clarity from these questions. I'll have to bookmark this one to actually make reference to it at every point in time.