I just bought the Buka Invasion deck for Blue Moon. Some interesting new ideas - you can play a card upside down as a bluff, with a value of 2. Your opponent can call your bluff and win a dragon if he catches you out! They also have ships that you can load up with cards and then dump them all in one go.
Les and I are planning to have our first Blue Moon deck-building contest. Not sure if we are going to use the Basic deck-building rules, or use the Emissaries and Inquisitors decks? Either way the Buka gives me a few extra options and maybe the chance to catch him out!