Where do you get the god cards on Yu-Gi-Oh World Championship 2008

I belive you must join a wireless game with a Yugioh Nightmare troubadour on ds that has a god card. You then can buy the god card for I belive 4,200 DP. The Nightmare Troubadour game will not lose the god card if you buy it, or any other card. This is the only way to get cards like Raigeki, and Monster Reborn.