Thanks for the comments! Yeah, in my case, I would want to use the Overlord as my general (for obvious reasons).
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I think you should reconsider Brittle Effigy: with a Crystalline on the board you won't be able to save any of your slivers with it, and as spot removal for your opponent's critters it is inefficient and vulnerable. I recommend Sedge Slivers for survivability/pump.