[Dimaz]

Well, it's true that I talk from the events in this game, but IMHO currently the spell is not balanced in general. Of course when you reach charm and all boosters you will probably have better success using real mages. But in my tests 1 H3 + skellyspam for example was guaranteed to convert 1 MR18 commander within 50 turn limit, so it's not that rare (of course, in the particular situation in current game it's completely my fault as I knew test results before losing my thugs and still lost them). Also, as noted by Kuritza in private communication, with H3 0-res the AI really don't have much choice of what to cast, so it just keeps spamming this until MR fails.