Extremely overpowered. 100
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(which, by the way, isn't hard to get with Fractal Pests or even regular pest decks) means instant kill. Even if you don't want to go for the OTK, you can get a quick EM with a handful of
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and
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. Oh right, and this is just the unupped version. Upgraded, you only need 50
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for the OTK and 50
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for a guaranteed EM. The permanent isn't even expensive.
I say scrap the "Use multiple times per turns" bit, and balance from there.