Assume the balance of the force is already with the Dark Side going into the force phase. If DS maintains force is the balance considered to be "set" to the DS again? I need to know if I can play this card in a game where DS will be holding force pretty much the whole game or if it only works when DS takes force back from you.
The Balance of the Force is only “set” to a particular side if it has to change. If the Balance of the Force is with the dark side, and the DS player wins the Force struggle, the Balance of the Force just remains on the dark side and isn’t set to anything.
If the LS player has the Force, and the DS player wins the Force struggle, then the Balance of the Force would be set to the DS (as it has to change from LS to DS).