The owner of this deck hasn't added a sideboard, they probably should...
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I don't think of ever seen a Relentless Rats deck without a Thrumming Stone. Check out the rat deck I just made: http://mtgvault.com/1111222334/decks/another-rat-deck/
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Yeah, I would put a couple of Thrumming Stones in the deck! It will make a world of difference!
Swarmyard?