The metamagic stuff. I think the idea is cool, however I think it should cut the sp cost down dramatically, but not remove the cost completely. As your proposal, they will be diminishing their returns as you click the second, third, 4th enhancement, so people will take max and empower ones and not take others. I think if it was similar to the existing meta magic savers, but stacks, it would allow warmages to be that much more desirable. Meaning instead of dual savants, you will have focused savant warmages.