One of the biggest things I am worried about with your build is the reliance on straight draws.
I believe the only reason that legacy elf combo is able to exist in the current meta is because of the sheer draw power and synergy of
Glimpse of Nature,
Wirewood Symbiote, and
Elvish Visionary.
Elvish Visionary is probably the best elf in the deck. Drawing more cards in legacy is tantamount to winning in most cases.
A few well placed Lightning Bolts,
Abrupt Decay, or
Fatal Push on your lords will drastically slow you down.
Toxic Deluge is also a card that can still wipe your field, leaving you with an abysmally slow recovery. While all of these cards will hurt me just as much, a
Glimpse of Nature and a few creatures later will see me back in the action.
There is a new enchantment coming out in Ixalan:
Shapers' Sanctuary. I have been thinking about adding to my sideboard, it seems like a wonderful addition. Legacy elves has already proven that a single copy of
Leovold, Emissary of Trest is extremely potent in many match-ups as a
Green Sun's Zenith target (I highly suggest you at least put him in your sideboard). Having a mini version as a back up could be a possibility.
Further more, I don't think
Dwynen, Gilt-Leaf Daen is worth the mana to cast him. You would much rather be playing any of your other elves, or casting a
Green Sun's Zenith for another Arch Druid. As they say, winning is winning. Having more life is nice, but winning with 10 life is the same as winning with 30.
Also,
Deathrite Shaman should absolutely be a 4 count card. It is simply too useful in almost every match-up. The graveyard hate on your opponents is incredibly necessary, it helps protect from unwanted Flashbacks from a
Snapcaster Mage (just
exile the spell they target with Snapcaster before the ETB ability can resolve) as well as helping to keep those pesky Tarmogoyfs from getting too big. Lastly, you can pull any number of other pertinent cards such as re-animator targets, wastelands, or combo pieces .