Land:
5x Forest
4x Mountain
4x Taiga
3x Wasteland
2x Wooded Foothills (I like playing only 2 since maze kills these)
1x Strip Mine
Green:
4x Root Maze
3x Tarmogoyf (this guy is great, easily a 3/4 or 4/5 with all the stuff in your library plus your opponenets)
2x Hidden Guerrillas (i like playing both hiddens since your not going to get someone to play a instant or artifact all the time)
2x Hidden Gibbons
1x Mire Boa
1x River Boa
1x Krosan Grip
1x Elvish Spirit Guide
Red:
4x Lightning Bolt
3x Kird Ape
3x Gorilla Shaman
3x Simian Spirit Guide
2x Tin Street Hooligan
2x Magus of the Moon (blood moon with a 2/2 body)
Gold:
2x Artifact Mutation
Artifact:
3x Chalice of the Void
4x Null Rod
Sideboard:
1x Pyroclasm (useful for EtW)
4x Red Elemental Blast (should i knock this down to 2 and add 2 Pyroblast to split it up?)
4x Leyline of the Void
1x Krosan Grip
4x Incinerate
1x Artifact Mutation
Here's some critique.
Interesting idea, using Tarmgoyf. I would additionally run some seal enchantments (Seal of Primordium and/or Seal of Fire) to make him bigger, though. If you think it's worth the risk, Land Grant would also put some sorceries in your graveyard, and they could replace your fetches.
Leyline of the Void by itself is not enough to battle Ichorid. You'll want to stop Bazaar as well, since it can be used to dig for more enchantment removal to gang up even on multiple Leylines. Moons can help, but it would be a good idea to try and fit in Pithing Needles too. Of course, if Ichorid goes into decline, you may not need even the Leylines anymore.
Like Kowal said, you probably want to add in more moons. I usually have four, and that's not often enough if they're the ones on sticks. They're vital against GAT now, as getting two basic islands for a Gushathon is a lot harder, and if you manage to resolve a moon early enough, you might not get dispatched so quickly by Fastbond.
Another difference of opinion I hold is that in the current metagame, with Long and GAT running rampant, you'll probably need Pyrostatic Pillar. You can switch them for Mutations against Stax, or even keep around a set of Tin-Streets for your two-for-one needs.
I'm not sure if anyone's mentioned Gathan Raiders here yet, but I think they're utterly beastly. Thing is, Tarmogoyf could end up being even larger, though Raiders certainly combo with lizards. I originally scrapped R/G because its creatures were smaller than everyone else's, but between Goyf and Raiders, that might have changed somewhat. Combos well with Mongrel, too, and with Megaliths.
Sudden Shock might be good now, too, since you can sometimes kill Dryads and just about always kill Psychatogs if you can manage not to get it duressed. In that slot, though, I'd probably just go with Flametongue Kavu. Expensive two-for-one vs. a split-second card that may or may not kill what it's aimed at?
I may be out of my element in this metagame, but GAT seems to have filled in the void that control decks left, and to beat it you need similar forms of disruption and the biggest creatures you can find. I think R/G has potential right now.