Well the first and last are more simple, but the last one strikes me as too good since you will have counters everywhere. It might be okay, but it for sure needs playtesting. It's probably the simplest of the three though, so getting it right would really help. I dunno if I'd call it Flux anymore though... maybe Chrono instead if you go with option three? Might be too close to Chroma though...
Middle one is just too hard to keep track of imo. If it were me, I would try to make the third one work. As long as it's not regularly better than Grasp of Darkness, then it's fine, and so at least with that card, it works. It's just so much easier to keep track of too.>pic
Probably broken concept I'm fiddling with to replace the Wrathcharger that should really be RG.