He's referring to the fact that you can mod rare cards and then win them back. And no it is not a glitch, it's just an infinately better/more efficient way of gaining rare items.

But hey, if you want to spend a year to get Holy Wars rather than 10 minutes so that you don't feel like you 'cheated' be my guest. Most of us, on the other hand, have a life to attend to. :rolleyes2