[Black Leviathan]

There's a lot of enchantments that can be case on "Any" that you could put on a zombie. Before or after it's raised it's still an "Any". The whole advantage to zombies is they're cheap. For the price of an enchantment or two you could raise hundreds of the dead. It would only make sense if you had a nearly limitless font of mana or a very limited supply of corpses.