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Maybe instead of the Astral cornucopia, add Ugin, The spirit dragon for more board control, then you might want to consider changing the the lux cannon out for more mana production or board control...maybe even add in Tomb of the spirit dragon for life gain. Mainly because the lux cannon is nice but you need more survivability while your waiting to pull out BlightSteel or the Darksteel Reactor...I really like the concept just seems to be a bit vulnerable. Also I just got done making a Colorless artifact deck you should check it out http://www.mtgvault.com/raginxpenguin/decks/urzas-myr-ugin/
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Cornucopia and coretapper combo together. Ugin is nice and all, but this is an artifact build that wins with reactor. Ugin isn't needed here
lol wow I miss read astral..I feel like a tard now lol