I just remembered something. I am going to have to double check this tomorrow when I get more adventures (unless someone else can confirm this before then).
But I think in G lovers mafia will automatically equip brimstone bracelet (-3 MP cost of skills) before casting a mood buff/tongue of walrus.
Even though the brimstone bracelet has no G so it should not provide said -3MP per cast bonus. (it shouldn't, but does it? I will try to remember to test that too)
Doing this adds unnecessary server access as well as slowing down the game. Also, if you happen to have a -2MP cost item that has G in it, it won't get used since -3MP is better (if it worked). I will do some proper spading on this tomorrow.