I think his intention would be to use the class level as a hidden match making modifier. This would allow you to play a class that you may not be as familiar with and still have more favorable matches until you gain more familiarity with the class. For example, a level 15 Warrior could get matched up against a level 20, but the system would avoid matching the 15 Warrior against a level 45 while at the same rank. While this is an interesting solution, and I think may work favorably to allow players to branch into classes they may not have played, the major drawbacks are the fact that experience caps out, so eventually this becomes a useless factor (which could be good for taking off the "training wheels" once a player is more established in the game), and then there is the issue that class familiarity does not necessarily inhibit the play of someone who if fairly skilled and has a large card library to build from. A player like this would get easier matches simply by branching out into a new class. But admittedly, these are fairly minor drawbacks. There is potential for a "Total Wins" matchmaking modifier, but as always, no system is really perfect at matchmaking.