Here are some changes for Clash Royale not relating to cards that I suggest:
Overtime increased by 180 seconds(Battles with Tournament Standards):
Although Supercell's previous update is very effective in preventing draws, it is completely possible to have even 0-0 draws with 6 minutes gameplay(I experienced 2 draws in 13 challenge battles.) This is not just a waste of time(especially younger players whose playing time are limited) and also a waste of time. So, I believe 9-minutes gameplay should be able to solve this problem.
Decrease Shop Legendary costs to 30 000(from 40 000)
For free-to-play players, Legendaries are already very difficult to obtain, and to celebrate their progress to Legend Arena, you give them this in the shop?
Delete the TV Royale
The TV Royale is a useless thingy that showcases very close battles, and random level 1 trollers with lots of Legendaries beating level 7 and 8's. How do we "Watch and Learn"?