Side board is really non existant right now and even though I hsould never make it to turn 6, I'm thinking about adding in a couple Domri Rade because the draw isnt bad and getting to his -6 would be crazy good with this build.
imo i would drop hellraiser goblin for Hellrider because it will add another thing with haste and something that rewards you for attacking instead of making you have to attack if that makes sense. i have played with the goblin and in my experience there has been alot of times where me having to attack with everything hurts me in the long run. i like dormi rade myself in a creature heavy deck otherwise your just showing your opponent what you have, but unless you have complete control and if your playing with a player who knows whats going on getting to that -7 is a challenge in its self. i also dont think arbor elf is right for your deck you dont really need to ramp into and i feel like it be better to put another creature in there to give you more creatures to put pressure on. i also suggest looking at Ash Zealot or Stromkirk Noble the noble is a good 1 drop specially if the oppent leaves it unchecked it can get strong fast ontop of if you can drop a bloodrush on it.
Arbor Elf is not an Aggro card, it's for Mid-Range decks that want to play their Loxodon Smiter s on turn 2. I would cut them for 2 more lands, a 4th Spear and a 4th Slaughterhorn.
I'd also cut Hellrazer, the global haste is nice, but he could be sending your guys to their deaths on turn 4, or leaving you exposed to deadly alpha retalitory strikes. Instead run some Experiment One s. Cackler, Geist, and Emmisary can evolve him turn 2 to a 2/2, Boar can evolve him turn 3 (so you can haste the Boar) into a 3/3 if you evolved him on turn 2 and you have a mountain (possible by turn 3).
However, I like a more 2-drop oriented package. Don't forget about Lightning Mauler , playable off of Emissary and you can haste the pair of them to swing for 4 on turn 2, and that's not counting your 1-drop. I like Ash Zealot over Geist, but I favor Red over Green. Geist could play well with Experiment One.
Also, you realize Domri can also help act as removal right? Swing with the team, Bloodrush a guy, then second mainphase, -2 Domri have your Bloodrushed guy kill another guy. Removal is Aggro's best friend for keeping up lots of pressure. Plus you're running Geist so if you use him with Rancor + Bloodrush him, even if he dies, he's just going to come back as a 3/2 and you can replay Rancor. Virtualy no card loss for you.
The sideboard was basically an afterthought... it was basically just some left overs from my RDW. I didnt do to bad I won 4 out of 8 games and 1 out of 3 matches and ended up with 4th out of 9. once I get used to playing it and develop a better sideboard I feel like I will do better. Even though I don't have to shocks and buddy lands for this yet, I actually never had any problems with my mana in any of the games other than getting flooded once.
my best hand was BTE to BTE to Boar tap an elf to untap a forest play rancor on the boar, fervor was already out on the board swing unapposed for 9. next turn, BTE to Geist tap elf rancor the boar again swing for 15 they blocked 2 from my boar with their lingering souls tokens took 13 and it was over, that was turn 5 with no missed drops. The one deck that gives me the most trouble is midrange, they allow a few attacks but then once they get 5 lands i cant touch them. Control is no trouble and other aggro is just who can keep the pressure on better.