Panik8

God Deck? This gets killed by a single spell by any color, except mono-black...

Blue : Hurkyl's Recall / Energy Flux / Rebuild / Reduce to Dreams
Red : Shatterstorm / Decree of Annihilition / Furnace Dragon / Jokulhaups / Obliterate / Pulverize
White : Akroma's Vengeance / Austere Command / Fracturing Gust / Purify / Serenity
Green : Creeping Corrosion / Fracturing Gust / Seeds of Innocence / Uktabi Kong
Colorless : Kill Switch / Nevinyrral's Disk
Black+White : Merciless Eviction
Black+Red : Corrosion

...and I'm probably forgetting many more. I'm not saying your deck is bad, in fact, it's pretty decent, but you have nothing to counter your opponent's spells, so if they know how to magic and have any of the cards listed above in their sideboard, you lose. You only have one half-decent creature that can deal damage and you don't even have enough Sharpnel Blasts to deal 20 damage to your opponent, so even if you draw your entire deck, anyone with a Flying creature can stop your Broodstar.

A friend of mine spent hundreds of dollars on an affinity deck. You can get 90% of the cards listed above for under a 1$ each.

In my opinion, you should add some counters (after-all, you're playing blue...), another Shrapnel, something to give Haste, Unblockable and/or Trample ability to your creatures, etc...

Here's a few suggestions...

-Assert Authority (Counterspell, Affinity for Artifact)
-Whispersilk Cloak (Equipped Creature has Shroud and is Unblockable)
-Non-artifact Lands (Replace Vault of Whispers and Tree of Tales, as long as you're not playing Black or Green cards, anyways...)

...that said, it's still a great deck, but one similar to one of my friend's (although he ran stuff like Prismatic Angel and Mycosynth Golem, etc...), and which I know can be easily beaten.

Here's a link to my Food Chain Goblin deck. I even took out Kiki-Jiki, Krenko and Instigators, because I simply didn't need them (and I intend to use them in another Goblin deck I'm working on). Once Food Chain hits the battlefield, it's usually game over if I'm playing 1v1. In multiplayed formats, everyone usually turns on me when I empty half my library on turn 3. :)

http://www.mtgvault.com/panik8/decks/panikgoblin-vintage/

I'm not sure if you're open to suggestions, but here's my 2¢. Chances are you're already aware of everything that follows, but if not, I think you should consider a few options which have always worked well for me.

In my opinion, you really need to add a way to sacrifice Goblins for mana. For example, if you add a Skirk Prospector, you can sacrifice 2 Goblins to the Skirk Prospector for 2 red mana and then a 3rd Goblin to the Siege-Gang Commander's ability. Otherwise, you'll be very limited in the ways you can win the game (mass attack with pumped-up Goblin Piledriver + Loyalist for trample) and rather easy to counter (any mass removal).

You could also want to add a Goblin Sharpshooter (or more), which works very well with Skirk Prospector and Siege-Gang Commander, if you decide to use those too. Basically, you'll tap the Sharpshooter for 1 damage, sacrifice a Goblin to the Prospector for a red mana, which will untap the Sharpshooter, tap it again for another damage, sacrifice another Goblin for another mana, Sharpshooter untaps again, retap for a 3rd point of damage, sacrifice a Goblin to the Commander for 2 damage, which untaps the Sharpshooter yet again, etc... This effectively counters mass removal (sorta...), since you can sacrifice your entire army before it gets annihilated and at least get some damage done.

Another very strong option you might want to consider (as an alternative to using Aether Vials) is to splash into Green, for Food Chain. I've been playing Food Chain Goblins for years and it never lets me down. Never. It basically allows you to sacrifice any creature for 1 more mana of than its converted mana cost, and works very well with Goblin Chieftain, which reduces your goblins' mana cost to begin with.

I played my Food Chain Goblins deck, yesterday and I had 3 Chieftains on the battlefield along with Food Chain, at some point in the game, so my Goblin Recruiters would cost me 1 Red mana to cast, but grant me 5 Red mana when I sacrificed them to Food Chain. Long story short, the Recruiter was not only having me draw tons of Goblins, but also allowing me to have tons of mana to have everything I cast enter the game. For that matter, Incinerators, Matrons and Ringleaders (along with Mudbutton Torchrunners, check those out) are the best creatures to sacrifice to Food Chain, since they're almost useless once their main ability resolves.

Finally, since Food Chain only costs 2G, I have no problem running my deck with 18 lands, although I use 4 Skirk Prospectors so I can rely on them in case I'd get mana-starved for some reason.

Hehe, yeah, I figured it was just for fun. :)

Lands are wrong, in my opinion. You want to consistently have RRR on turn 3, while if you split lands 50/50, you'll often have to wait until turn 8 or 10 to have those 3 Mountain and Seismic Assault. You want to mulligan if you don't start with Seismic Assault, but having to mulligan because you don't have enough Mountain will kill you.
Remove some Islands, I'd replace 8 of them with 4x Evolving Wilds and 4x Terramorphic Expanse and replace another 8 Islands with 8 Mountains, or R/U multicolored lands, such as Izzet Boilerworks or anything similar.
If all else fails and you simply want to keep this deck as cheap as possible, then I'd run 36-40 Mountain and 12-16 Island.

You're welcome! Good luck at FNM!

+1. Agreed, nice combo. Like Vile suggested, Rogue's Passage would probably be a good addition for those 2 cards that are missing from the deck, at the time of writing this comment.

Interesting Deck. I like to build "cheap" decks too, because I've often been told that expensive decks have an advantage, which generally makes sense, but considering this deck and a few of my own ideas, there are still many ways to have a "competitive" deck on a smaller budget, in most formats.

That being said, I'm pretty sure Blazing Salvo isn't Modern-legal, see http://gatherer.wizards.com/Pages/Card/Printings.aspx?multiverseid=368507. I didn't check every card in your deck, but that one stuck out because of the "old" layout of the card, so I checked it out on Gatherer. The card was re-printed recently as part of the Duel Decks series, but that series isn't included in the Modern format block-list, as far as I know. Feel free to double-check, I'd hate to be wrong on this one, see http://www.wizards.com/Magic/TCG/Resources.aspx?x=judge/resources/sfrmodern.