It was recently discovered that there is some sort of leak in the gamecard system that blizzard utilizes. Every single gamecard that is created by blizzard corresponds to the creation of a new gamecard according to a particular algorithm. However, as soon as a gamecard key is activated, it will no longer trigger a new gamecard key. Therefore, an un-used gamecard key must be used for this process or you will get an invalid code. ***Your code must also not be used 12-24 hours after you have gene...