Advanced Learning
Your study of the fundamental nature of magic enables you to cross the boundaries that normally divide the various sources of magical power.
Prerequisites: Any metamagic feat, able to cast 2nd-level spells from at least two spellcasting level progressions.
Benefit: When you gain this feat, and at every second level thereafter, you may add one spell from any spell list to which you have access to any other spell list to which you have access. This spell may not be higher than the highest level spell you can cast. The spell becomes a spell of the same type as other spells of the target spell list.
Example: Nikolai, a 5th level wizard/7th level ur-priest, takes Advanced Learning as his 12th level feat and chooses to add circle of death, a 6th-level wizard spell, to his ur-priest spell list. Nikolai may now prepare circle of death in a 6th-level ur-priest spell slot, and he casts it as a divine spell when he does so. Two levels later, at 14th level, Nikolai may choose another spell from either of his spell lists to add to the other, even if he has not gained any levels in any spellcasting classes.