Madcap Skills ?

i'd ditch the Foundry Street Denizen and the Cryptborn Horror add 2 Fanatic of Mogis , 2 Mizzium Mortars and 2 Purphoros, God of the Forge

I would get rid of the "Nykthos, Shrine to Nyx" and just play 3 mountains instead, because you need to be able to play your stuff on time and ash zealot, BTE, and boros reckoner all need mountains having colorless mana doesn't help. And everything in your deck is low costed so you don't have anything to ramp for.Instead of skullcrack I would use lighting strike you will want to be able to hit creatures, and clear the way so you can keep attacking. I would still keep skullcrack in the sideboard.
I would cut the "Cryptborn Horror" out of the deck and put in two more fanatic of Mogis.-2 magma jet-4 skullcrack move to sideboard-2 cryptborn horror-1 madcap skills-3 nykthos, shrine to nyx+3 mountains+3 lighting strike+2 fanatic of mogis+4 Fire drinker satry having more one drops is just going to help the deck be faster.

Legion Loyalist is a good one-drop for decks looking to drop lots of creatures and swing out every turn.

try Firefist Striker over Gore-House Chainwalker , getting around blockers can be more usefull than the extra point of damage.

And for a bit of more controversial advice that other people will disagree with, Chandra's Phoenix over Boros Reckoner . Reckoner is a good defender, but a rather lackluster attacker. Reckoner has the extra point of devotion, but the Phoenix is harder to block, has haste and you can get him back if he is killed, which is useful in a deck like this where you quickly dump your hand and can end up top carding if things don't work out. Boros Reckoner is neat, but he is not really an aggro card.

also, think about these for the Sideboard: Burning Earth (more fun than ever with people playing Mana Confluence ), Skullcrack (because life gain is your worst nightmare) and Frostburn Weird , unless you do take Boros Reckoner out then he should have this slot in your Sideboard (because no matter how fast your deck is there may come a time when you need a blocker, you just shouldn't main board them).

Thanks for all the advice, really helpful, but White-Green Aggro is still a problem, considering they can drop a 3/3 turn 2, a 4/4 turn 3, and a 5/5 turn 4, any suggestions?

Splash white in side for Banishing Light and Chained to the Rocks ? you can always run Temple of Triumph and Sacred Foundry in the main without too much damage to your reallllly low curve.

Blinding Flare might be alright for forcing some more damage through and keeping their big guys from blocking. Sideboarding Harness by Force might work also if you just take their big guys and attack with them. Really you just have to hope for that early Madcap Skills to screw up their blocking.

depending on the type of selesnya aggro Legion Loyalist can be useful, with the last part of that ability that no one remembers. even a lot of selesnya decks that don't go heavy token still run Advent of the Wurm .

other than that, you could put Mizzium Mortars in your sideboard

also, i know a few comments above i said to take out Boros Reckoner , and i stand by that, but if you are being out raced by another aggro deck, that is the time to board them back in. Boros Reckoner is useful in your sideboard because he can trade with those big creatures

Chandra THE pyromancer