Wall of Frost is a good defender and yes I could use something to replace the skeletons with but (1)(B) creature with (B) Regenerate is also a good defender. Call to Heel/Negate might work for keeping creatures/spells in check although I may use Essence Scatter instead. If you can think of anything specific to change please leave card names in comment.
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A fan of solid color decks I see. Very nice indeed. Pilferers/Gravedigger/Shriekmaw combo would be a pain to play against.
Oh btw, check out my new deck :) just need a few more Jace and maybe a replacement for the Skeletons and it will be a fun one.
I would say replace Cinder Wall with the Dragon Fodder Goblin tokens for blocking when you need to. Voracious Dragon could take the place of the Bodyguard and you should really use Lightning Bolt instead of Shock like Walrus said (one more dmg can make the difference sometimes). Try that and see how it plays out.
The only hole in my game with this deck is against flying creatures....I can't block em. If I don't get a Path or O-Ring I'm royally screwed.
I might also recommend getting rid of Raging Goblin because if you are thinking he's going to stay in play long you would be wrong. The haste makes him seem useful (and he may be for the first couple rounds) but if you draw him late game and they have anything in play that haste becomes useless very quickly. Also check out Voracious Dragon: (3)(R)(R) Flying, Devour 1 When Voracious Dragon comes into play it deals damage to target player of creature equal to twice the number of Goblin Creatures it devoured. Im iffy on that one but try it out and see. Can't hurt to try.
Change Blaze to Fireball. If you want to stick with goblin theme exchange piker with dragon fodder (gets you more goblin creatures for your mana and you can use em to block in a pinch). I'll keep looking through my reds to see if there is anything else.
Falkart. Very nice site, simplest deck building tool I've seen.