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Sliver deck with mirror entity.
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Why do you want Mirror Entity if all of the rest of your creatures will be slivers already???
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Simple: I can pay X to make all my creatures X/X, plus the bonuses of all the other slivers. I don't care about making them all changelings. I have mirror strictly for the pump.
You have PLENTY of pumps with Might Sliver and sinew sliver. You'll have trouble paying to pump as you're busy casting more and more slivers or saving mana for an avoid fate.
1st turn- Virulent, 2nd turn, muscle, third turn mirror, 4th turn swing for 15. Its just another win condition. I like having good options.