I like seeing somebody try and use
Harness the Storm in Modern! It's a potentially insanely powerful card and I think you're on the right track for using it optimally.
Thought scour seems especially good here since it fills your yard with more spells to Harness, and being able to copy one in your yard, making it UU: Draw 2, mill 4 seems insane.
Serum visions is sort of in the same boat, smooths out draws, give you another option on T1, and is really sweet with an active Harness.
Hope this gives you some ideas! Good luck