What about something like this?
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No, it doesn't fit the original post anymore, but yes it is still un-upped (granted a few more rares have appeared) but it retains the idea of using scarabs as having built-in "+1 purify if you generate a scarab every turn" this time with Acceleration building attack without truly decreasing HP. I tried it out un-upped vs AI3 and it was OK but I'm not sure it has any real promise beyond being new and/or fun.