No Nissa, Worldwaker? Gives you something to do when you have to much land if you need to find something to do with it

Also Idk ur meta but in mine a copy or two of Unravel the Aether always helps with gods

Also I have to play a few constellation decks(junk reanimator) or I always find Back to Nature in my SB fantastic

Cjk is right. Nissa, Worldwaker would be a great addition to this deck. I don't even use her for the ultimate ability for more than a few more lands - hedge against board wipes - but she is still great at pumping for monstrosity and other X-value costs. I ran a similar deck on a regular basis at FNM. It was focused using hydras with her in it as an augment and it was fun watching my opponent squirm.

I would suggest removing 2 Polukranos, World Eater - he is Legendary, and I agree with your method of use to drop the others as an agro-style move and board clearing. However, so long as one is on the field and your opponent can only chump to prevent damage, having any number in your hand is a dead card to hold. I also find if he has trample, opponents will only block if they are forced to. He ends up sitting longer than you really want him to for your play style. I play with 2 and still regularly see him in play - especially with Genesis Hydra and Chord of Calling to bring him out.

Remove a Nykthos, Shrine to Nyx - Same reason as Polly. Take out 2 Forest, add 2-3 Nissa and balance with Darksteel Citadel. 4/4 Indestructibles are quite tough to play against. Give them trample from Nylea, God of the Hunt against a weenie deck and you'll have them on the run all game long. They also make for great chumpers against midrange decks and monster creatures, saving your Pollys, Arbors, and Hornets to do the dirty work on your opponent. The more threats you have, the harder it is for your opponent to come around on you.

My favorite item of removal for enchantments is Fade into Antiquity - It has great flexibility in targeting and removes them from the game entirely. I have it as a sideboard for play against Gods, Perilous Vault, and other dangerous cards that threaten my game style.