I would add some tutors b/c you could potentially draw too many lands with treasure hunt making battle of wits useless. Also some counterspells to prevent battle of wits' death. Just friendly suggestions, but good job!
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You should add an Emeria the sky ruin, ZEN land that says as long as you have 7 plains you get to return a creature to the battlefield. Enters tapped. It would work well with your lands currently, also return some of those lifegain creatures, or the Ascendents. Anyways it is just an idea.
In addition to the font of mythos, I would also recommend you adding a set of dreamborn muse if you do want that sort of win condition as well.
Try a font of mythos, it is a great draw artifact.
If you are going to have mana ramping artifacts, I would recommend you add Caged Sun.