I am looking for any comments, helpful information or advice, etc. on how this could be improved. In playtesting, it can push out 20 damage on turn 5, so I am wondering if that is decent enough to be successful. I want to keep it strictly Green-White. I am curious, also, since I haven't bought most of these cards, if this archetype is even valid in the Standard meta.
My idea was that with Rootborn Defenses and Druid's Deliverance, I would be fairly safe against aggro, since Delver is no longer relevant. I am also thinking about removing Collective Blessing and adding another Parallel Lives, but the Blessing is a blowout if it resolves, which it most likely will.
I was considering GWB Tokens for Lingering Souls, but as it isn't instant-speed, and requires another color, then Midnight Haunting will be sufficient for my needs.
I like this more aggro oriented build, but it is more expensive than I am wanting the deck to be. As for the comment about the Armada Wurm, it is a good card, and I may run them, if I pull them or get a good trade, but I think that they are a little hard to get out, which is the same reason for only running 2 Trostanis.
The problem with the OP's deck is that it's getting pulled in 2 directions. One side wants to make lots of tokens, the other side wants to make good tokens. You could take the deck in either direction.
I bumped the land count up to 22 (20 seemed WAY low to me). I'm not sold on your choice of Evolving Wilds, but I stuck with it here to help assure Trostani comes out ASAP (plus thinning lands later on is generally a good idea with this deck). Selesnya Charm is just too good/versatile to leave out of the maindeck.
One last comment on Nevermore as a sideboard choice. I feel like this card is overlooked as a sideboard choice because it's not great against aggro/tempo decks. But against control decks or specific sideboard hate, it's very good. Since there are specific cards that can just completely hose a token deck (Detention Sphere, Sever the Bloodline, etc.) it can be very comforting to have a preemptive counter to these problem cards (especially if you know your meta and which hate cards people are running).
With the extra ramp I put in the deck, pulling out an Increasing Devotion early isn't hard. Afterwards, dropping a Collective Blessing afterwards is brutal, making your measly mana dorks into 4/4 attackers and your tokens even more so.
Collective Blessing and Intangible Virtue are what make this deck. If both are on the field and you have anything resembling a presence, token-wise, you win the game, save a sweep. I found Vitu-Ghazi to also be phenomenal, helping me to pump out either centaurs or spirits when the need arose. Deathrite Shaman is also wonderful just because of his interaction with all decks and any deck with g/b should be playing. He actually only saw the board once all tournament, but in that game alone, did 8 damage, and gained me 2 life. He's a champ.
I am curious, also, since I haven't bought most of these cards, if this archetype is even valid in the Standard meta.
In my experience, tokens are being focused pretty hard by other decks. People continue to build anti-token but don't seem to be overly concerned with the W/U/R Miracles deck floating around. Sever, O Ring 2.0 plus the multitude of Miracles are making it harder to run an effective token deck, especially one that focuses on building out and not up (many small vs. few big).
I prefer GW beatdown with ramp. Skip the tokens altogether, toss in 8 mana dorks, some fast early damage and start dropping Aramda Wurms on turn four. If Trostoni came out in turn three that's +10 life.