[Snake]

Well, here's a wild and fitting idea. "Mage Items" count for this passive, such as Witch Hat, Overload Amulet, Grimalkin's Hat, Focus Ring, High Mage's Cape, Caster's Robe, Priest Robe, Cloak of Many Colors, Nullstone Gauntlet(?), Tomes. A bit of extra work to debunk which fits or not but I said it was wild.

Personally just having it cost 2 SP and be percentage based with no restrictions is a nice buff for Evoker's current lack of big damage like it used to have.