Serious pay to play game. I can't belive what you've now done with the crystal barrels. They're practically worthless now. It quickly becomes incredibly slow and boring unless you're willing to pay for in game currencies and upgrades. It seems to get worse with time too. The goals for the main game have become ridiculous. The rank of each card seems arbitary, as I constantly get certain epic cards, yet can't get common cards that I need. Don't waste your time or money!