Mana Shield
Circles: Life, Protection
Description: Any enemy Sorcerer Lord casting a spell that targets your Sorcerer Lord (including cities and units under his control) must pay 1.5X the normal mana cost of the spell.

I'm trying to get this moved to the spell list. We need to pick a tier. However, this one may have to wait a while. At the moment we don't know just how many spells will actually target a Sorcerer Lord (or their cities) so it may be hard to select a good tier.