I really like 1 and 2! I was always a fan of level caps in the leagues, just makes it more fun in my opinion. And I never really understood why they were removed, and not fixed.

On 3. - I think that part is the excitement of Survival. Having to be very careful with your cards, or just not use the key cards. It also ties nicely to what was promised for Land - the Revival Potion. If that was implemented, the Cooldown wouldn't be a problem anymore. If you need a card urgently, you can quickly revive it, if you're willing to pay the price. Or be more careful in using it next time.

Thanks for this summary!