I haven't bought cards these last two days. I decided to buy one today which is i68 Kalimba. It's just a Common card, and the reason why I bought this card is my wife loves to play Kalimba. In fact, I bought one for her. Meanwhile, the card gave me 10 Luck.
My ranking dropped to #2016. Probably, I haven't bought any card recently. Also, I often forget to do some missions. I'm at Level 56 though.