First take with mono Green. SB changes with meta game. After seeing Rumti play Swarm Shambler I came up with the second version.
I watch Rumti and RintMS that I watch for updates to the archetype.
Another build I just thought up to increase the number of routes to a Turn 4 Henge is to remove 2 Yorvo for 2 Garruk and -4 Beetle adding 4 Lotus Cobra. T2 cobra, T3 untapped land makes 4 mana to cast Garruk, most likely make a token then on T4 +1 garruk to give +3/3 to either lotus cobra or the beast token and cast henge. It would look like this:
The new cards I am going to be adding are: +3 Old-growth troll, -3 Garruk's Harbinger, +3 Battle Mammoth, +1 Vivien, Monster's Advocate, -4 Swarm Shambler. I sacrificed the possibility of playing T4 Henge by mutating on T1/2 Swarm Shambler for a better card in other stages of the game with Battle Mammoth. Being able to cast Mammoth on T4 then Henge on 5 is still good.
We'll see about Old-Growth Troll over harbinger as harbinger had a leg up on Rogues and Dimir and I have to worry less about not hitting GGG on T3 by play one of my 3 colorless lands.
So T4 henge with:
T4 land drop and Beast or Mammoth in play - 2 ways
Caryatid with 4 power creature; Razer(mutated requires 4th land drop), troll or Snake (land drop not required) - 1 required creature with 1 of 12 others
A 5/5 or 6/6 Gemrazer mutated onto a snake - 1 required creature with 1 of 4 others
I took out 2 Turntimber Symbiosis for 2 forest as when the Troll dies I need a forest in play and there have been times I didnt have a forest or not enough! Also it isnt too often that I would actually play the spell, more often then not I was dealing with the cons of the land side. ALSO I learned if you mutate onto Troll and it gets killed both the Troll and the mutate card can go onto a forest for DOUBLE ramp and double 4/4s.
Also I added 1 Primal Might main and moved a Ram through to the sideboard. I cut the forth Henge for a Vivien, I was drawing too many henges and my opening hand had too many in them. Vivien plays well with Henge, great fun.
Over time I am sure that those 2 sorcerous spyglass and 1 Questing beasts will turn into 3 Vorinclex, Monsterous Raider as that card is just insane!
Testing vorinclex over Battle Mammoth to see if I like it better, I am sure I will. Main deck answers for sagas and Ugin/planeswalkers, double counters for stonecoil and creatures from the henge, 6/6 haste(clear some spots in the sideboard). Poor Mammoth and poor wallet if this turns out better. I will be also adding 2 castles and removing 2 forests to ensure I can cast Vorinclex at 5 mana.
+3 vorinclex, -3 Battle Mammoth. Only 1 turntimber symbiosis, 4 castles for vorinclex, more forests, only 1 crawling barrens now. 2/2 split of ram through and primal might.
I am currently shopping for good deals on Vorinclex as it is the better card over Battle Mammoth. I know that is a completely obvious statement but my testing has 100% solidified it. To date I am 40-18 in 12 "Traditional Standard Event"s on MtgA, the event that costs 1000 gold and is best of three. Due to the power of Vorinclex's haste, it makes me think of a more aggro version of mono green that plays 4 questing beast, 4 Garruk's Harbinger and 6-8 removal spells main.
Since adding Vorinclex to the main I am 112-51, 69%(3/23/21)win rate, playing the "Traditional Standard Event" on Arena. I am interested in building my collection then I am climbing the ladder as I get more coin and cards playing that event.
In paper I have removed Battle Mammoths back for Swarm Shamblers until I get Vorinclex in paper, Mammoths just dont fit the curve.
I am seriously considering replacing Ilysian Caryatid with Tangled Florahedron as it will allow me to keep more hands. Too often I keep hands with like 2 lands and a caryatid hoping the caryatid can carry my hand until I draw more lands then it gets killed. If it is a Hedron then that would guarantee my 3rd land.
Another thing that occurred to me is having 4 Hedrons over Caryatids is that I would have 30 lands; maybe I could get rid of a forest and Turntimber Symbiosis for 2 more spells. 28 total lands then +1Primal might and +1Ram through or Snakeskin Veil??? That would make more room in the sideboard, for whatever, +2 Questing Beast??
It would look like this:
I fear keeping 1 turntimber symbiosis will affect my forest count for troll and castle so I will keep track how many times I miss it.
3/15/21: I jammed a lot of games on area this weekend with this configuration of removing Caryatids for Florahedrons and my theory played out. It was a little difficult determining whether or not Cary would have been better then Flora because some of those situations played out where I play Flora as a land Turn1 then draw lands. For example I have a hand with 2 lands and 1 Flora then play it turn 1 then turn 2 draw another land THEN it remains to be unknown whether or not the opponent had T2 removal. Despite that I counted many times where having the card in hand enabled me to keep my hand as Flora was my 3rd guaranteed land or it enabled me to curve into other spells.
The question is now what takes the 2 spots as I removed 1 forest and the Turntimber Symbiosis. Right now I got +1 Primal Might and +1 Wildborn preserver or Fiend Artisan ~ trying it out.
Fiend artisan seems good against rogues and untapping with it could be good if I had 7 mana and a chump then I could search out Vorinclex. Otherwise against rogues artisan could be huge and mutating Gemrazer on it would make it bigger and give it trample. With 4 ram through already being brought in against rogues it might be big enough to kill the opponent out right.
fiend artisan was never good, interestingly enough I never played it against Rogues but main decking a card that is only hypothetically good against 1 deck isn't worth it. Online I am playing 2 Wildborn Preservers and they are ok.
4/8/21: Taking Preservers out for Swarm Shamblers. Better gemrazer targets, cost less, more cards to turn on lovestruck Beast. Never really got to abuse a Preserver, all instances were extreme situations of 'win more'.