What happens when you are playing Ad Nauseam? That would be a very interesting matchup.

Why not run Leyline of Sanctity in the sideboard? Seems like burn decks and other highly aggressive decks would be your biggest issue, as they could kill you before you could assemble all of your combo components.
Leyline of Sanctity would also help against forced discard strategies like those seen in Jund, Junk, and 8-Rack decks.

I would take out all three of the Priviledged Possesions (as they are 5 Mana) and put in an additional Spellskite (to take care of the obvious creature hate and because most enchantment removal is tied to artifact removal (like Naturalize) and also one more of both Fabricate and Idyllic Tutor.

This looks so awesome. I like how you can use pain lands to get where you need to be faster.