Some notes from a dedicated MUD player meself
(My List: http://deckbox.org/sets/458941):

Voltaic Key kicks ass.
Spine of Ish Sah is a great card to Forgemaster out, and I'd run it mainboard.
Ensnaring Bridge is actually super awful for this deck because almost none of your guys can ever attack, and you can't even kill it without a forgemaster, a spine, a ratchet bomb, or karn.
I'm a fan of Emperion Sideboard, and a Steel Hellkite mainboard, as it's 2nd ability can stall other people out.
Wastelands and City of Traitors?  How about a Crucible of Worlds to Wasteland lock people, or just for value?
I actually cut Revoker from my list as it cannot hit lands, so Maze of Ith and Dark Depths/Thespian's Stage got super annoying.
I also cut my Staff of Domination, because if you can't combo with it, it's usually pretty underwhelming.
I see you are going for pure colorless, and that's A-OK, I'd do that if I had Rishadan Ports, but with mono-brown you need more locks.  Look at Sphere of Resistance and Thorn of Amethyst.