Mana Ramp
Elvish Mystic, Llanowar Elves, Noble Hierarch and Voyaging Satyr (for Nykthos, Shrine to Nyx) will power out your draw engines on turn 2 instead of turn 3, which is very important.

Card Draw
Heartwood Storyteller , Ohran Viper and Regal Force work pretty good.

Finishers
Slapping down a turn 4 or 5 Craterhoof Behemoth for the winning strike is the optimal play, but sometimes a lone untouched Primordial Hydra does the trick just as well.

Additional Notes:
Having this many Mana Dorks do look like too many at first glance, but I kept adding more for: 1) More consistent fast mana. 2) They count as extra cards when Regal Force comes into play. 3) They become huge monsters when Craterhoof Behemoth hits the table. So their effects are threefold, Mana, cards, win conditions.

Very important! Don't over commit and empty your hand with this deck. You will find you can almost always keep a full hand of creatures while keeping a strong board presence because of the card drawing from Heartwood Storyteller , Ohran Viper and Regal Force. Usually all you need is 4-5 creatures and a freshly casted Craterhoof Behemoth for a win, or just let a Primordial Hydra get stupid big. There is no need to power out 14 creatures and lose to a well timed Wrath of God.