#5 - March 23, 2013, 3:01 p.m.
Yup, you're looking for The Forge! You "buy into" a game with packs of cards, which you could have earned by just playing others (or purchased, if you so choose), you and your opponent draft a deck with randomly presented cards, and if you win your Forge match you get to keep all the cards you chose to play with as well as some additional unopened packs. The specifics of that may change throughout testing of course, but that's the premise.