[Sorcery] Afflicting Magic Resistance

[VariousRen]

As my parties designated buff wizard, I have been working on a spell to help our party members resist the magic effects of other wizards. I settled on afflicting magic resistance 10, which accomplishes everything I want it to. However, a question arose about afflicting magic resistance on a wizard. Magic Resistance as written does not allow characters with magery (Sorcerous Empowerment) to have it, and if you have magic resistance you cannot cast spells.

If I afflict an enemy (or friendly for that matter) mage with magic resistance, do they immediately lose the ability to cast spells? It seems like the proper way would be to make an affliction that negated the Sorcerous Empowerment advantage, but then what happens when they have magic resistance afflicted upon them?