My-a naya

First off I would like to say this looks like a fun deck to play. Next I think you should throw the Spellbreaker Behemoth in your sideboard, you already have his cousin but this helps against counter deck which is always good. Now if you really want to slim it down here are my thoughts. I think you should take out the druid of the animas, they are nice but you have creatures for mana already and you don't need much more. Next you should take out the sunsinger because it is a good card but it promotes you needing all that extra mana. Next I think you should take out all naturalizes, the card can help but you can use 2 fracturing gusts to destroy all artifacts and enchantments, which might seem bad because of your O-rings and the other things you have to buff up your creatures but this spell should only be cast right before an attack so it hurts them more than it hurts you and only as a last resort, but just in case keep the naturalizes in the sideboard. Next get rid of one O-ring and the path to exile, you are playing huge creatures so you shouldn't need that much removal anyway. This deck looks like it was made to play against more than one person so you should be fine with the amount of mana you have left. I also think you should take out Uril, I know he is a 5/5 for 5 and has shroud but you don't really need him here. After you take those out you should have 58 cards so i think you should put in 2 fogs for some extra protection. Anyway I hope at least some of my suggestions helped and if you would like me to look at any of your other decks let me know! Good Luck Deck Building!