[Valerius]

Well, if it were causing problems my suggestion would do little to fix that since it doesn't make it any more difficult to use effectively (in the way that increasing the cost of rain of stones from 1 to 2 gems did make that spell more difficult to use effectively).

If I had thrown out the idea of making it MR negates (and I'm not suggesting that as I don't know that it would be a good idea) then that would be completely different and I agree that would need serious debate as you get into questions about the balance between armored (usually recruitable) and unarmored (usually summons or freespawn) troops.

It's really just a price adjustment, as it seems to me that it should cost a bit more than one gem to weaken all the armor on the battlefield. It's not really a significant change - but of course if it isn't significant then you could argue why bother making it to begin with.