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Basically the idea is to get a lot of mana and use the myr galvanizer to untap and get more mana/ make millions of copies of propagator and buff up the Arcbound Crusher. If all else fails, use the Welder to imprint dead myrs and/or use myr resivoir to bring them back and mirrorworks them.
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I love Myrs, and I get what you're trying to do here, but in my experience, the color Myr mana makers are better than palladium. It really stinks to just need one more W and all you got is 3 Palladiums. I'd say drop all four for 2 each of Gold and Silver Myrs. You can also see some of what I did different in my Amyrican deck here: http://www.mtgvault.com/ViewDeck.aspx?DeckID=146782
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Or even 1 W and 3 U now that I notice your color breakdown. :-)
Oh yeah, it might be an availability issue, but I would lean way more on Stoic Rebuttal than Cancel or Foil in a deck basically guaranteed to have metalcraft. Worst case, it costs the same as Cancel anyway. Stoic is the jam.