Fixed that for you (you had the wrong spell).Simularcrum:
"If you cast this spell again, any currently active duplicates you created with this spell are instantly destroyed."
The description of the spell does not say that it cannot have more than one.
So, your contention is that you're only casting the spell once? That seems laughable on its face, since you're ending up with two. Doesn't matter, anyway. All the putative demigawd's simulacra disappear when the antimagic field lands on him, so they're all gone away by the time he finds himself helpless in front of the wizard, anyway. Oh, well, these things happen when an idiot savant goes up against a genius.