Your Card List and Rewards

every time u complete the free mode u get a card.
how can i use these cards? u can complete some achievements.
but... i dont remember my cards...

so wanna do a CARD LIST where u can view all ur cards u got?

and also wanna make some REWARDS my making combinationm (apart the achievements)?

Yeah I was Also was wondering what these cards were for does any even have a random idea for them