I don't know why I'm commenting on this but there are a few HUGE problems with this idea.
1:
Abzan Banner should be replaced with
Orzhov Cluestone, if it is kept at all. You have no need for green mana, and the cluestone is more efficient.
2: Nykthos? In a colorless deck? Needs to be replaced.
3: Speaking of lands, what do
Blinkmoth Well or
Bant Panorama do in here? In addition, if you are running the Urzatron, run 4 copies of each. Since you are in legacy anyway, and already high budget,
Cloudpost,
Glimmerpost, and
Vesuva are better than the Urzatron.
4:
Aether Searcher does nothing for you.
5: If you are attacking with a creature in this kind of deck, it will be a massive scary bomb that doesnt need improvement.
Banshee's blade and
Armory of Iroas are unnecessary.
6:
Arcbound Crusher should be reconsidered. There are far better things to play for four mana. Like
Arcbound Reclaimer,
Bonehoard,
Clock of Omens,
Unwinding Clock, etc
7: More
All is Dust.
All is Dust is king.
8: If adding more
All is Dust, remove
Elspeth, Knight Errant. While we are at it, remove
Endless Cockroaches and the cluestones/banners and make it all colorless. This will allow you to consolidate your mana as well, adding more useful colorless lands like
Thespian's Stage and
Dark Depths9: Try to reduce the number of high CMC spells you have. This will allow you to add smaller spells to fill your curve.
Sorry for the wall of text, just a few suggestions. Its a cool take on Tron.