This is the most frustrating game in the world, if you don't have patience, or have anger problems, I suggest you don't play this game, or you might end up with a broken monitor.
lol
In response to JohnnyCrunk, there are enough ways to earn cards, Mainly challenges. Also, What would make this game better, would, I agree reduce the luck factor, and Even the matches out, I am always getting stuck battling higher ranks than me, I am rank 13 and have had to go against a rank 28 before.
Also there isn't a refuse button, so you either have to play them or lose...