I thought Dragon wasn't an energy type? Its not like it really matters though since no attacks require Dragon energy, but I would think that Prism doesn't add a type of energy that doesn't exist on any other card in the game.
I think on this one the turn player replaces last, not first, but I don't remember and I don't have my rulebook with me. I'll look it up when I get home.
...also, I got really really mad when I found out the last theme decks to be printed with actual rulebooks were the Call of Legends ones. The backs of playmats are horrible.