Not a bad idea but against creature aggro, this is actually to slow, Creature aggro right now can kill on turn 4 normally, Whats the most damage you can do by turn 4? Turn one Vexing they take 4 at 16, turn 2 Searing spear or 2 pillar, they are at 12 or 13, turn 3 searing spear and a pillar puts them at 7 or 8 then spark trooper. You'd need atleast 2 vexxing devils to win before creature aggro especially if they go first. Put in something to make it so you can last a few extra turns even just one extra turn and this should be great.
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Veilborn Ghoul is in there as a discard for Pack Rat, Keeps coming back to my hand not in there to actually play unless I need to. Ashmouth would be terrible in this deck because to keep him in play i'd have to sack a creature making Pack Rat get weaker.
http://www.mtgvault.com/ViewDeck.aspx?DeckID=372676 theres the link to the deck we came up with, somewhat comparable to yours just more creature based for when things dont work out right.
A friend and I designed a pretty decent worldfire deck a few days ago and tested it out, it actually works pretty well, except we use Fiend Hunter / O ring on Erdwall Ripper / Fervant Cathar (both haste) to Just end it all the same turn lol