Speaking of mobius, his suggestion of Jade Mage was better than Elvish Visionary but I think the correct move is to just ignore the early game and use Nylea's Disciple to recoup some of the lost life (much like Saruli Gatekeepers in Neb's Jund build). I was having a few beers last night so it was a perfect night to bust out my Timmy deck, and here is where I ended up:
4 x
Gruul Guildgate12 x
Forest9 x
Mountain3 x
Ground Assault2 x
Volcanic Geyser4 x
Cultivate3 x
Darksteel Ingot2 x
Anger of the Gods4 x
Nylea's Disciple2 x
Ogre Battledriver3 x
Garruk's Packleader2 x
Arbor Colossus1 x
Stormbreath Dragon2 x
Terra Stomper1 x
Soul of Zendikar1 x
Inferno Titan3 x
Pelakka Wurm2 x
Siege DragonI have maximum Cultivates and Ingots because I want to skip to five mana on turn four as often as possible. I've gone up to a second Volcanic Geyser because I fried plenty of Baneslayers with it last night; it's a great card here because it gets rid of those big annoying things with the option to go straight to the face, at instant-speed no less.
Nylea's Disciple proved her worth as I topdecked her to gain 14 while I was on just 1 life against a red deck. I couldn't attack with my 2 Arbor Colossoi and 2 Pelakka Wurms into his 4 goblin tokens because he was on 20 life and would have killed me on the backswing with a single token.
I think I'm done testing Fattledriver, this is my list. I'm glad others are enjoying building their own variations on the concept.