Corpsejack Menace and Ajani, Mentor of Heroes.

All of the Eldrazi from the upcoming set with ETB triggers of return a card from exile get effect X will be great here because with Ana in play they'll go right back.

Pfft Mayael the Anima's fatties are fatter =P

Too many decks run her and they all end up with, more or less, the same creatures. With this deck you have the potential utility that black can give you.

Landfall creatures are allstars in Karametra decks. Avenger of Zendikar and Emeria Shepherd, Admonition Angel, Rampaging Baloths, and Lotus Cobra can be damned terrifying. Even Seer's Sundial has its merits.

Also, hydra tribal with no Oran-Rief Hydra, with your insane landfall?

Oran-Rief Hydra is in there. The other cards were not included because we haven't talked about a few of them and the rest were in the deck previosuly but were removed to help facilitate the theme we were going for.

I would remove:

Smite the Monstrous for Swords to Plowshares or Path to Exile. Both do pretty much the same thing, so your pick.

Oblivion Ring for Quarantine Zone. Scales better into late game.

I don't know why you're not running Aura Shards with all those creatures. If you want it to be instant speed add in Vedalken Orrery for flash or Chord of Calling for instant speed tutor

Cultivate or Kodama's Reach are much better than Natural Connection. (unless natural connection is in there for instant speed landfall, then Harrow, if you want a creature then Sakura-Tribe Elder)

creature based removal: Terastodon, Bane of Progress, Woodfall Primus, Fiend Hunter

card draw: Seer's Sundial, Mentor of the Meek, Primordial Sage

And last, if board wipe or whatever else Praetor's Counsel. And Cloudstone Curio for some fun :). Otherwise, i would try to work on landfall abilities and have more lands. great deck, good luck, and i hope these helped :)

Never have I ever seen a Karametra deck this good. +1.

Elemental Bond and Soul of the Harvest are probably just what you need for your draw power desires.

Scour from Existence comes to mind. Also Ezuri's Predation, Swords to Plowshares, The Great Aurora and Wrath of God.

Idk if you meant spot removal. I know green doesn't have too many options, but white has its fare share.

You should take advantage of devotion. Put in Karametra's Acolyte and Nykthos, Shrine to Nyx add that with Khalni Hydra and you generate a ton of mana. I would take out all myr and Avacyn. Add in Ulvenwald Hydra, Managorger Hydra, and maybe Champion of Lambholt. For card draw add in Momentous Fall, Mind's Eye, Soul of the Harvest. For board wipe, add in Rout, All Is Dust, Final Judgement, Planar Cleansing, but also add in Ghostway and Faith's Reward so you can easily recover from board wipe if you need to. Instead of Norn's Annex use Ghostly Prison or Sphere of Safety and maybe add in Heliod, God of the Sun.

For lands, add in Emeria, The Sky Ruin and also add in Prismatic Omen that will fix your mana a lot better and activate Emeria. You don't need fetch lands in two color with green. Just use Cultivate and similar cards. Maybe add in Enlightened Tutor or Idyllic Tutor to get enchantment or artifact you want.

Also consider Zendikar Resurgent and Spidersilk Armor as they're both really good enchantments for green decks.