Not...really because his Bone Prison is already top tier for that, and the frozen mage line is good for actually splitting the enemy team.
Like...Poison Nova I think will be a very niche pick. Very very niche. It's akin to Diablos Lightning Breath, as in you never go it unless you really wanna go it.
The game I picked Skeleton Mages might not have been the best example because we were getting destroyed but it felt so useless.