Elf Burn using Howl of the Horde for massive damage.

1 drop

Elvish Mystic - Ramp

2 drop

Lightning Strike - Burn

Rattleclaw Mystic - Ramp. I swapped these in for Sylvan Caryatid (thanks, gumbogogo) because I didn't want Defender.

3 drop

Courser of Kruphix - Smooth draws, lifegain, and blocking.

Hordeling Outburst - Chump blockers, a GY card for Treasure Cruise, Convoke bodies for Stoke the Flames , and a possible finisher with Howl of the Horde.

Howl of the Horde - Copy stuff. Easier to cast with green there to ramp.

Divination - I've found that I manage to Howl this more often than I'd expected. 6 cards for 6 mana ain't too shabby. Better'n Opportunity. This deck requires a LOT of cards since Howl requires an extra card and Master the Way is only good with a full hand.

4 drop

Stoke the Flames - Howl for 12 damage possibly... With Hordeling Outburst it could even turn into 28 damage for 6 mana if you also have two Howls.

5 drop

Master the Way - Meh by itself but great with Howl of the Horde and there should be enough draw in the deck that it could do decent damage to tip the scale.

8 drop

Treasure Cruise - Instants and sorceries should help fill the GY, and in combination with the ramp, it shouldn't be too hard to cast, and turns into 9 cards potentially with Howl. Considering switching to Dig Through Time since obviously 9 cards is a bit much and I'd get to choose more, but right now I like potentially only paying 1 mana for this.