Thanks for the comments, everyone!
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Arch-vile he certainly can be useful as a counter, but you're right that he is neither sturdy or quite reliable enough for it. I'm contemplating giving him another pip in his life, but we'll see.
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Scytale you're probably right about him not being quite worth it for the mixed army, but I'm okay with having a thematic counterdraft. My reference may be a little too on the nose for Linux. I was contemplating burying it between his two names, like Osli Nux or something to that effect. Then I would have Linux OS hidden in his name.
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Lyrgard I'm glad you like his theme. He's that more than anything. I probably won't do any 0 power units in this wave (since this is the one power wave), but I'll consider it for something to try down the road.