B/G Elves/Stax. Ramp to many using land fetch, mana dorks, and hit huge Exsanguinate, Genesis Wave, Death Cloud using giant mana producing engines like Rofellos, Llanowar Emissary , Mana Reflection, Gaea's Cradle, Cabal Coffers, Wirewood Lodge.

Craterhoof Behemoth, which is arguably the best elf tribal card, is also a great finisher a turn after Avenger of Zendikar, and Lord of Extinction absolutely dominates late game.

Kozilek, Butcher of Truth, Skullclamp, Phyrexian Arena, Sensei's Divining Top and really any of my many tutors help for draw and consistency, and Geth's Grimoire + Nath of the Gilt-Leaf or Nath of the Gilt-Leaf + Skullclamp or Geth's Grimoire + Liliana of the Veil net huge amounts of cards every turn, and with a good amount of land tutors and mana acceleration really huge threats (like the Koz') can drop as soon as turn 4.

This deck (or at least the deck an iteration or so ago), was used in an article on gathering magic about Nath of the Gilt Leaf (mine is the second):

http://www.gatheringmagic.com/jasonalt-050814-75-getting-nathy-in-a-good-way/

Need to add (still!): Time of Need , Tooth and Nail, and Regal Force, but those can wait for now. No joke: this deck only loses in 1v1 when it gets mana screwed, which is exceedingly rare. There's enough card draw to keep the tempo up, and after the latest additions, enough tutors to consistently get mana dorks into play and threats into hand.