I like the Nightmare clan's bonus (hence the pic) but they need to get a few more good cards (a better damage reducer and minus attack would be nice)
Tough call, but I would have to say that Ulu Watu is the most balanced clan. Use what is fun for you to play though. All of the clans can be good if you play them right.
Yapyapyap, hehehe, all are in the hnds of the players.