First of all, thanks for the suggestions.
This deck is designed as a beat-down deck, with Wildfire thrown in there just to give some extra beatings. I only have 12 (count 'em) colored spells (4 Wildfire, 4 Dark Rit, 4 Covetous Dragon). I never have a problem with getting the particular color that I need, so I'm not worried about it.
The Metalworkers stay. They kick ass. I can drop my whole hand on turn 2:
1)Swamp, Dark Rit, Metalworker.
2)Tap Metalworker, reveal 2 Grim Monoliths, Phyrexian Colossus, and 2 Voltaic Keys. Cast them all. Go.
That is usually when the other player screams.
I like the blaze idea, but I don't know what to take out for them.
As far as the Shivan Hellkites go, they are one of my favorite creatures of all time. However, I am not running that much red mana, so they wouldn't do as much damage as a Masticore can. In my Regular Wildfire deck, I am running 2 Shivan Hellkites main board, with 2 more in the Sideboard.
However, I really like the Pillage idea. I will replace the Howling Mines for Pillages.
I like the Avatar of Woe idea, as well. But only one or 2.
So, here is the deck as it now stands
4 Sulfurous Springs
9 Mountains
7 Swamps
4 Metalworker
4 Grim Monolith
4 Thran Dynamo
4 Voltaic Key
4 Phyrexian Colossus
3 Masticore
1 Avatar of Woe
4 Covetous Dragon
4 Wildfire
4 Dark Ritual
4 Pillage
Thanks for you help, guys.