If I didn't already own the base game, I'd be tempted to join this drop. I might still go in on it anyways and sell my old copy to a friend.
In either case, I can't recommend this game enough. It's a fantastic deck-building board game with a push-you-luck mechanic that builds tension throughout the game perfectly. This game is basically the perfect mash-up of Ascension and Incan Gold/Diamant.