The owner of this deck hasn't added a sideboard, they probably should...
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NOTE: Set by owner when deck was made.
I'd recommend at least sideboarding some anti-enchantment cards now that Solemnity is in print and cheap. It would counter the whole deck on its own.
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I hadn't really thought of a sideboard for this deck. If I built it, it would most likely just be casual, so i'm not too terribly worried about a sideboard.
Have you considered Pyrrhic Revival? It's pretty nasty when the graveyard is full of 1/1 creatures. They all come into play, then promptly die, and Blowfly Infestation now has a ton of -1/-1 counters to distribute to the stronger creatures. If your Necroskitter is in play, you potentially just robbed their whole graveyard.