It'll be very hard to make an unupped deck for beating all false gods. However, if you use your oracle prediction wisely, you can construct an unupped deck that will beat one specific false god with fairly good odds. For instance, if you get Serket as your oracle predicted FG of the day, basically any unupped deck with 6 wings will completely destroy him, because he has no damage sources that get through wings. Check out the strategy subforum of the FG section of the forums.