Wasn't the nerf a bit too harsh? They reduced the number by only 2, and Necromancers are already rarely used; people use Transformers more. But here, they nerfed it by 5 times...
Also, let's look at HOTU. Vampires are allowed, but without boxes or hiding spots, no one uses them. And here, they were nerfed even more.
The Necromancer nerf is quite decent; the weakest Tier 7 unit in the game, instead of Angels, has been significantly weakened.
I agree, it looks harsh, but I haven't tested it.