Cost/Benefit for Castle types

[Ironhawk]

I like this idea. It would be a great response to the madcastling conundrum.

BUT

If you were implement it (were that even possible in dom2) you would simply be waltzing straight into the "ghost rider's are overpowered" holy war, because this effectively removes the only cost-effective defense to it.

Were ghost riders somehow to not have an impact on this design decision tho: I think you have a great idea.