We have very different play styles. I don't run tutors.
1.
Ulamog the Infinite Gyre. You're running draw based on playing creatures (
Guardian Project) and having lots of creatures (
Shamanic Revelation) but not having a big creature (
Rishkar's Expertise), so he works against your deck's card draw. Same with your lands which would rather you play several creatures (
Gaea's Cradle, Growing Rites of Itlomoc) for 11 mana than 1 big colorless one (
Nykthos, Shrine to Nyx). If you had a way to give it haste (besides
Finale of Devastation) I'd think it'd be better for the deck as a finisher.
2.
Ulvenwald Hydra. He costs a lot of mana, which again works against your draw philosophy, and isn't an elf or druid so he's off-tribe. If 4 land tutors +drawing lots of cards doesn't get you the lands you need...
3.
Craterhoof Behemoth. I just hate this card. No other reason.
4.
Llanowar Tribe. As much as I like this card in an elf deck, I hate having a turn one
Boreal Druid or a turn 1-2 land that taps for colorless and not being able to play this on turn 2. It's better for devotions sake compared to the
Fyndhorn Elder and
Greenweaver Druid and taps for more...but missing out on turn 2 hurts the power of this card. I would say it's pure green mana cost could matter, but in this deck it doesn't because you're not running cost reducers.
5.
Forest. In decks that are heavy on one-mana mana-dorks, I run 25 lands. You could drop 2 and go down to 30 in this deck without it being a problem.
6.
Birds of Paradise. I can tell you want more turn 1 ramp options, but thereafter it works against you for synergy (Marwyn /
Priest of Titania /
Wirewood Channeler)
7.
Wild Growth. Same as above, but as a non-creature it doesn't even help with
Guardian Project,
Craterhoof Behemoth, the sacrifice tutors, etc. It is safer from board wipes though.
I'd suggest the last 2 be replaced with
Elvish Pioneer and
Krosan Wayfarer (both 1 mana druids) and since you're running the best lands in the game, it'd be crazy to not run
Stone-Seeder Hierophant.
What's the eldrazi + Marath combo? What's Marath?