I would remove 2 of the sigil's of the empty throne. You are pretty heavy in the 5 CMC range. Consider running 2 isolation zones. Yeah, they cost 4, but it gives you the ability to
exile other permanents besides creatures. Another strong possibility would be 2 Quarantine Fields. This gives you the option to
exile plainswalkers too, which is huge. Also, since you have no real way to tutor out enchantments, consider running 2-3 (or a playset if you want the alternate win con) of
hedron alignment. That will give you the ability to cycle through your deck with scry, and still provide you enchantment support. Plus it is hexproof, so that's cool.
Myth realized is also a great one drop for this deck too. It steadily builds as you play more and more enchantments, counts towards Nyx, and then when you swing, just pay a white to get like a swinging 20/20 or something. You then can use it to block the following turn, as it reverts back to an enchantment at EOT.