[Suggestion] Dispell?

Perhaps I just haven't researched to the right point or picked the right sov, but I haven't yet seen a spell to dispell positive buffs cast by your opponent on his own units. If it really doesn't exist, I'd suggest that it would be useful to have both a dispell and mass dispell. Units would have a chance to resist your dispelling of their buff just like any other resistance test against a hostile spell.