in the upcoming Clash Royale November update, we are going to have the insane special event challenges. And the first one is gonna be the King’s Cup!
The King's Cup is the first event of many other upcoming special event's. There will be more other event's in the Future
The Cost joining the King's club is 5 Gems! The first run is for free.
Blind Deck Challenge: There is a rule called Blind Deck Challenge. You have to play a blind deck, containing 6 defined cards and 2 random cards.