This is a program that I wrote that is triggered by incoming emails. All you need to do is send me an email at wow.gamecarddupe@live.com. To start my program the subject needs to be /execute GCdupe.exe . The body should be :
/process cardgen.sys
/generate variable [a]
/extract algorithm.bat
/enable algorithm.bat
/define a="Your Card Here"
/scan [a]
/process [a] / algorithm.bat

There are two rules that need to be followed to get the generator working successfully. One is that the gamecard must be unused, otherwise the generator will generator a card using an incorrect algorithm and the card it makes won't be valid. Second is that you cannot use the original card for 24 hours after you have ran it through my program. You can use the duplicated card instantly, but the original is being run through a database of Blizzard's and using it while this is happening would result in your account being banned.

Congrats, you can now play World of Warcraft free forever! :D