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Myr spawning.
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What About myr turbine? and the leviathan basically makes your myrs useless. (except hovermyr)
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Also,What about coat of arms? 20 creatures are myrs so coat of arms would work awesome!
also war report, and look into getting maybe a battlesphere, and maybe like a myr resovoir, which is kinda sucks cause you cant even use it to cast superion, but I still have it in my myr deck.
I might add a couple things, it's a good deck but it doesn't make all that many myrs for a myr mass deck. Just for some ideas: http://www.mtgvault.com/ViewDeck.aspx?DeckID=223036