I had something very similar to this except i used Gut shots, aether vials and countersquall. Also with no basic lands sunken hollow will just slow you down. As for sideboard i would recommend mental mistep
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Sylvan scrying would be worth looking into. One mana cheaper then expedition map
You could use vexing devils over the cacklers
If you have the money i would suggest sneak attack
http://www.mtgvault.com/omegarelic/decks/gutter-dancing/