As the poor long-suffering GM who is to be suffering IF I allow this power to come to be, I will defend myself.
I will retain control of the campaign, as "power bloat" is a probem nobody likes.
Sadly, this power is simply too cool to just disallow completely, and frankly, it makes a lot of sense.
So, I will probably use the same solution recommended for Pre-cognition. "Unreliable." Often it'll work. Often it won't. Why? Ore bodies, steel mills, hordes of robotic insects (yes, that's planned for a future session, MUAHAHAHA!) etc.
In addition, this is a magical ability, so the sorceror able to slam it is also a perfectly usable idea.
And, yes, this is pretty much guaranteed to work on Iron Mask. Unless you make him mad enough to take off the mask....