Oh, and reason #4: A better chance to get the infinite mana combo. It requires 2 mana using Myrs and 2 Galvanizers. So, a Mirrorworks with any of the mana Myrs and one Galvanizer will work. (Tap mana myr, use ability on MG#1, tap mana myr, use ability on MG#2, rinse, repeat.)
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Trying this deck out on MTGO. The Celestial Colonnades are definitely a requirement. Keep gettng my ass kicked because I don't have the creatures to counter with. I would ditch the Myr Welder. It's okay, but it only works on "activated" abilities, not passive ones. Plus the exiling of your Myrs makes the Myr Turbine less effective. Probably outta replace them with 2x Shimmers. Also, the Myrsmith blows in comparison to Mirrorworks for 3 reasons: 1. Myrsmith is a creature with one toughness. You could blow on her and she'll fall into the graveyard. Mirrorworks is an artifact and a bit tougher to destroy. Mirrorworks also works with the Shimmer to cast with Flash. 2. Myrsmith gives you a crappy 1/1 Myr for 1 mana. Mirrorworks gives you a COPY of your Myr for 2 mana. And by far the best reason: 3. "Yo dawg, I herd you like Mirrorworks, so I put a Mirrorworks in your Mirrorworks so you can Mirrorworks while you Mirrorworks with your Mirrorworks. Then I put another Mirrorworks in there so you can Mirrorworks while you Mirrorworks with your Mirrorworks in your Mirrorworks doing your Mirrorworks on your Mirrorworks while you Mirrorworks. Then I put a Battlesphere on that shit, and da whole fuckin' world blows up."
Needs 4x Shimmer Myr. Thought you were going to put that in.