Going to throw this together as a casual deck until I can think of better uses for the mythics inside.  If I find that it functions well enough, I might strip out the Tinkers and Sol Ring to make it Legacy-legal.

Update 3/30/2011: So far so good.  Won the first game using this deck.  Found that it lagged badly after establishing a quick board presence.  Tezzeret is amazing, but more often than snagging an artifact, I want to nab things like Jace or Tinker.  Maybe drop a Tezzeret (current count 4) and something else for a couple of Brainstorms or Fact or Fictions ("Fact or Fictions"?  "Facts or Fiction"?  I dunno).

Mental note: Tezzeret's "conversion" ability doesn't end at EOT.  I didn't know that, I was wondering how in the hell I was going to protect him once I stuck him on the board.  Turns out it's as simple as "Hey, see that Mox over there?"

Update 4/1/2011: Got another Mox Opal today.  Put it in place of the Sol Ring to edge this deck closer to Legacy-friendly.  Removed Drowned Catacombs, they're a giant liability in a deck with so few basic lands.  Watery Graves or Polluted Deltas would be better, but I'll just proxy off more Underground Seas until I get something better.  Hell, ISLANDS would be better than Drowned Catacombs.

Considering adding Inkmoth Nexus.  I think I might go that route if I strip the Tinkers and Colossi out.

Update 4/4/2011: With the addition of a Library of Alexandria, all hopes of Legacy legality are basically lost.  Re-added Sol Ring, removed two Trinket Mages.  Added two Inkmoth Nexus, removed one Island and one Swamp.  Added one Polluted Delta, removed one Underground River.