Your build isn't set up for mages at all, I'm not sure why you're running them. You're also not using corpses at all which is a huge loss. I'd switch Mage to either Corpse Lance or Corpse Explosion.

Similarly, Command Skeletons is pretty useless, switch to Land of the Dead so that you can infinite spam whichever corpse skill you picked whenever it's up.

It basically looks like you're playing the build like Scythe is your primary damage dealer; the real DPS comes from the corpse skills. Simplicity's Strength and Depth Diggers should both be replaced too, check the build guides I linked.