For creature acceleration, swap out the Fyndhorn Elves and maybe one or two of the Herders for Lys Alana Huntmasters, Imperious Perfects, or Elvish Promenade.Try swapping out the Keldon Warlords with Elvish Vanguards. They are cheaper, and get counters for every elf that comes into play, instead of growing or shrinking as creatures are cast and killed.Sideboard suggestions: Jagged-Scar Archers, Essence Wardens, Elvish Guidance, Elvish Champion
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Why not Hunted Wumpus?
I think there is good potential!To expound on the mana ramp, I recommend Elvish Harbinger, which taps for any color mana and fetches another elf spell, and Elvish Archdruid, which taps for Green mana equal to the number of elves in play, while also giving all elves +1/+1. I would also recommend a Seething Song and/or Dark Ritual to help bring out Furyborn Hellkite, Hellkite Titan, or Malfegor. On the land front, Darigaaz's Caldera would work wonders with the focus on Red, Black, and Green mana that are already in the deck.As far as cheating your way in, I have had good luck with Pattern of Rebirth and Game Preserve (always a gamble, but less so with lots of large dragons).Don't ask me what to take out to support all these new cards, though, as I am terrible about bringing decks down to 60 cards.