Very cool deck. If you are looking to make it modern legal, the jace and the ponder and preordain have to go. Serum Visions is almost Preordain and you could probably make due with Jace Beleren or Jace, Architect of Thought.
To take advantage of Prismatic Omen, you could run Worldly Counsel, since you'll get domain 5 off of it. Another fun domain card is Tribal Flames, but Prismatic Omen + Valakut would probably let you have enough burn.