Fujin and Raijin share a card. It's not a particularily strong card (compared to the main character cards) and it's not hard to find, since it's not a special card and a lot of people use it. As well, you can also use Quezacotl's Card Command ability to make this card out of an Iron Giant or Jelleye during a battle. I've never actually used that ability, but if you feel like it, go ahead. So yeah, it's not a terribly special card by any means, but it's half way decent, and hey, it's exists, so be a cool cat and get one (or two, or three!) :D