I like how you have a few flyers in there. I created a Rat Deck that is currently weak to flight. If you're curious as to what it looks like here's the link: http://www.mtgvault.com/tchitcherine/decks/rat-king-deck/I agree with one of the comments below. You might want to get rid of Disentomb and add more Rats. That way you can build up the power of your rats so it's harder to send them to the graveyard.
Permalink
This is a pretty cool deck! Love the old school goblins. I'm currently working on a goblin deck as well. Thanks for sharing.