Read the full description for list of example generated game card codes.
The website is: http://wow-gamecard.freeoda.com/
Just go to the website, follow the instructions in video and the Game Card codes are yours!

Here are the some of EU Game Card codes it generated to me, feel free the try them out but might give you the 'Already used' message as there are many leechers out there:

2769-452227-36523-274332-0093
8781-627807-00448-009861-1769
8175-962524-70908-027752-3475
6874-949892-84004-062511-3764
5977-148272-09502-596011-1674
7628-725841-52468-627988-6916
1990-453809-76500-293146-3832
1638-757308-29204-453423-5742
3058-889325-51733-895746-4902
4854-543255-53496-475527-7434
9948-828829-88097-884827-3933
2820-310790-09033-256547-9470
2202-962465-77393-046365-0405

If all are used go to the website and get yours.