Apostacy on mindless lifeless constructs?

[Excist]

One additional reason the MR resists easily was needed to balance it is that with a range of 50 even if you put your expensive sacreds on the back line they are not out of range like with charm.

What this means is that if you have sacred mages and no sacred troops spamming Apostacy can routinely land 300-400 gold mages with no gem investment or even fatigue. This seems game breaking.

I don't mind if the spell did that on a lucky roll, but the boost to penetration seems like it makes it more likely with normal and only slightly high rolls.