When I posted the full and edited Elementalism rules, I mentioned that I was partially inspired by the M:tG mythology and mentioned that Mana Burn might be worth checking out. Later on, I mentioned that Eclipse: the Codex Persona was also a point-buy d20 system that appeared to be treading similar ground to the Fluidity Project.

Well, coming full circle, I now should mention that Paul Melroy, the author behind the aforementioned Eclipse (as well as a host of other products) also has a roleplaying game that is based on Magic. Mr. Melroy also has a wealth of RPG crunch (covering such disparate topics as Amber, Battletech and Champions) at his blog.