For Blissey decks? Also, with the loss of Double Colorless Energy, I think it has a use for extra draw power for decks that use attacks that cost more than one Colorless and can't use Triple Acceleration Energy.
Garchomp & Giratina-GX could be terrifying in Expanded with Double Dragon Energy and Team Magma's Secret Base...
Also, every time I see that artwork, I keep seeing Giratina riding Garchomp...
I think it's a case of The Pokemon Company putting their foot down on what to approve. During the credits, I think there was one listing of Pokemon staff that said something like "CGI Approval." Since the models are based off someone's fanart, I imagine the Pokemon Company not liking certain...