A new game is about to start so join an order.
You get the best cards from these special event games, that is where you will find SR and SSR cards. Otherwise you need to buy the legends card pack. Or just get really lucky with the daily draw and points from supporting friends.
remember to evolve your cards first before enhancing them. they will be much better in the long run if you do it in this order.
put in my referral code at the end of the tutorial: [Removed]
you'll get 100,000 rupies and a rare card