Hey there,
My first reaction to this deck is "wow, high mana curve". I usually try to keep my average mana cost below 3.50-yours is at 4.65. Even a couple of your low-end cards are what I call "false low CMC" cards, namely
Secure the Wastes and
Martial Coup. Those are 6+ drops hidden as 1 and 2 drops respectively. How often are you finding yourself keeping a hand that has no plays until turn 5? While it's true that you don't need a lot of early plays in commander, you don't want to be so far behind to start. It's not just that you're waiting multiple turns before doing anything, it's that you're also only able to play one spell a turn after that since each spell takes all your mana, and all that is assuming you hit a land drop all 5 first turns. You can't hand sculpt anymore with the new Vancouver mulligan (if your play group is following that rule change). A more bell-shaped curve with a lower average CMC will make your deck a lot smoother and more consistent.
Your card draw is a bit low for the long-game, which you're clearly planning on from the deck. All I see are
Well of Lost Dreams (a conditional mana sink) and
Shamanic Revelation (a fantastic card-IF you have a good board state). Try
Mentor of the Meek, which you will constantly trigger, or
Skullclamp (fantastic with 1/1 creatures!). Those will be absolute card draw ENGINES in this deck (and have a lower CMC).
Greater Good is a green staple, and is great in response to any board wipes (especially since any blink/bounce spells are permanent
exile for all your tokens.) I do not think that they should just replace what you already have, I think they should be additions to what you have.
For removal, I only saw two enchantment/artifact removal? Remember GW are the only colors to reliably destroy both of those. I'd like to see something versatile like
Austere Command in here. I'd also be interested in seeing
Freyalise, Llanowar's Fury in the 99 here. (I know I know I'm suggesting all these high CMC things, but I really think they'd be great in your deck. You can look at lower end things like
Kor Sanctifiers as a cheap spot removal+a body)
Some lower CMC cards I suggest you look into:
Brimaz, King of OreskosDauntless EscortMycoloth (He's a beast! 5 CMC isn't what I'd call "low", but it might be in this deck...)
Frontline MedicMirror EntityQuick note: I'd personally swap out
Selesnya Signet for
Nature's Lore. Still a 2 drop, doesn't get destroyed from artifact removal/sweepers, and can fetch your
Savannah /
Temple Garden /
Canopy Vista if you want the GW mana.
I hope what I had to say helped-happy deck building!