This proposal makes it a lot more expensive for people who only need rentals for brawls or tournaments. Are you sure that new players will like this idea? Don't they want to try before they buy? Season only rentals would also make it more expensive for them to learn which cards they do and don't need. There are other people who can't afford to rent cards like Tofu or Heliose all season. And if someone is in danger of getting kicked off of a leaderboard then they only want a strong card for 1 day. Not the entire season after it.