instead of volcanic geyser you should try Red sun's Zenith http://www.mtgvault.com/card/red-suns-zenith/MBS/, 30 lands is a lot, try with 20-25, i recommend in this case 23, and add goblin king http://www.mtgvault.com/card/goblin-king/10E/
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that's a traditional goblin deck, but you have to see this this goblin/explosion deck http://www.mtgvault.com/sacoduke/decks/explosive-goblins/
this deck is so awsome, put some goblin, artifact THEN ... BOOM in your face!! That my friend, is amazing.
wow this is the kind of deck that says: i love justin bieber. XD