>>32737977Success!
So as long as you haven't fucked around in the future before and don't use supports up there it'll literally only cost the 200 gems for the power up.
I'll try again one last time, this time using gengar to activate it. I did power up first because it's more accessible to everybody.
Funnily enough I discovered this with gengar.
I have a feeling gengar might need a skill refresh, not for himself as it won't matter since he can't use his skill while a JP boost is active (yeah power up item and gengar don't stack, for the record)
But if any support has been used in the future it could prevent all supports from working in the past ie big cooldown until the future time.
