Antipodean Metamagic - yeah, too powerful for a level 10 ability. I'd recommend you either increase the prerequisites so you can't get into this class until level 11+, or tone down this capstone, perhaps so that it only applies to Antipodean Admixture (and restore full casting).

Level 3: consider breaking up the level 2 ability into its two component Energy Admixture feats. Grant one at level 2 and one at level 3.

Wording: Antipodean Admixture: Should say "You may alter..."