Ok i used to complain about never winning cards. than i thought about it. most of us have been playing this for less than 2 weeks. there arnt that many cards to give out in the first place. when the new set comes out im sure the odds will go up. the reason its also low is because there needs to be a incentive to do the challenges.
supa8ball the odds of winning a card if u win decreases with the number of cards u already have. but from what i have heard from people and myself is that it on average is about a card every 10 wins give or take.