Yeah the deck looks pretty good, i have a similar deck that's mono black and it works pretty well. Hope the deck works for you!
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I'd swap typhoid rats and deathrite shaman round so rats are in the main. This is because Rats turn one/ turn 2 are more of a threat and will slow aggression long enough to where you can control heavily. Also typhoid goes with the pack rats which is a nice bonus. Having deathrite sideboarded allows you to switch it in against graveyard based plans. And i dont think arbor elf is needed at all. I like how your deck has a lot of draw potential late game but i think it would be nice if you had a huge bomb i think grislebrand/reaper of the abyss would work best as a x1
Personally i'd run 4x tragic slip instead of 2xTragic Slip 2xUltimate Price in the main deck .Also id up desecration demon to 4 because its board presence, removal and a threat all in one, which works really well for this deck. Not sure about mutilate since the chances of it doing much are slim, maybe sideboard and then bring it in against token/weenie decks. Typhoid rat looks like it could have a good place in here , not sure where it would fit tbh it just seems like it would work well and has nice synergy.
Mono red standard dragon abuse http://www.mtgvault.com/ViewDeck.aspx?DeckID=381035