With 38 lands, why not have all 3 shock lands, the 2 tango lands, and the 2 cycle dual lands?

Also, why Warped Landscape? It seems very slow. I think Ancient Tomb is a lot stronger. of course, its pretty pricey.

I've done a fair amount of rework on this after a few playtests. Found the early game to be severely lacking (which is most likely still is/will be) but shifted off some top end cards to more versatile power in the mid game. This was in hopes to offset the 'Archenemy' feel this build can get early game. I agree Warped Landscape is slow, however it does sort of tie into Eldrazi Displacer now and allow me to grab a land if need be. With all the fetches and shocks in there, Ancient Tomb makes me a little nervous (ignoring the price to get one). Am still very interested in any/all feedback.

I see Traverse the Outlands in the maybeboard. It is so powerful! Only 24 creatures, but as long as you have 3 or power on the battlefield it is gold!

Whenever I see a Green deck with several large creatures, my first suggestion is generally Defense of the Heart. It is fairly easy to trigger, particularly in multiplayer, and provides tremendous advantage if you successfully trigger it. Usually one of your targets should be Vorinclex, Voice of Hunger--the other creature can depend on what the situation requires.

Oops. Silly me. It seems I only looked at your decklist and not the maybeboard before posting. To add some actually useful advice:

You have a number of effects that allow you to untap lands. Perhaps you could add some enchantment-based ramp, such as Utopia Sprawl, Trace of Abundance, Overgrowth, Fertile Ground, or Dawn's Reflection. Untaping a land with Sword of Feast and Famine or its ilk is nice--untapping a land that produces multiple mana of any colour... even better.

Thank you for all the feedback! Traverse the Outlands does seem pretty good! Also liking the idea of Utopia Sprawl and Trace of Abundance / Fertile Ground. Anything in the decklist that really should be cut?

Cloudstone Curio and Temur Sabertooth can yield infinite mana by returning Zacama, Primal Calamity to your hand and replaying them.

Test the newest iteration and it went 3-0 in my playgroup in 4-player games. Most times they would band together to keep my threat level in check. Replaced Blasphemous Act with Day of Judgment, but thinking maybe I want Fumigate instead. Also, since our group does not allow infinite combos, removed Aggravated Assault and replaced it with Defense of the Heart. Also considering adding Gisela, Blade of Goldnight to the top end.

Eldrazi Displacer does not trigger Zacama, Primal Calamity's land untap ability seeing as he needs to be cast. If you have it in there for another reason that's totally cool but if not you have an open spot for a card!

Was wrestling with Eldrazi Displacer is worth a slot or not as well. It doesn't really fit the theme and not many ETB effects. Think cutting it would be the right call. Other slots I'm considering changing: Eternal Witness for Greenwarden of Murasa, Day of Judgment for Fumigate (as this deck takes a fair amount of early game damage), Rhonas the Indomitable for Gisela, Blade of Goldknight and Warped Landscape for Naya Panorama. Should I be concerned shifting that many 3 drops up the CMC scale?

I think your deck can handle it. You have a ton of ramp so you will probably take your early drops ramping anyway which means you will have some beefy game-changing things to play after your done ramping. Another good option for board wiping are tuck effects like Terminus and Hallowed Burial. Other options if you are looking for board wipe ideas are Fated Retribution and Rout which are costly but instant speed board wipes are insane.

Swapped Warped Landscape with Naya Panorama, Day of Judgment with Fumigate and Omnath, Locus of Rage with Gisela, Blade of Goldnight.

Next plan is to swap Rhonas the Indomitable with Selvala, Heart of the Wilds. Was thinking swapping Eldrazi Displacer with Anger?

I would try adding Molten Disaster to give the Zacama combo a bit of extra edge. Another concideradtion is Basilisk Collar for one shoting or Grafted Exoskeleton if your meta runs alot of indestructable creatures. Both options can give you one sided boardwipe like effect. Lastly you run alot of permanents so Genesis Wave or similar effects go well with to your mana doublers even with out Zacama. I dont know if your group is super aginst combo but Zacama is particularly good at "fair" combos. My deck(Zacama, Primal Assbeater) is geared to combo if youre intrested.

Finding the build either dumps the hand quickly then durdles, or struggles to hit the top end without mana doublers. To smooth out the build a little more considering the following changes: Emeria Angel for Shalai, Voice of Plenty, Fumigate for Rout, The Immortal Sun for Sunbird's Invocation, Courser of Kruphix with Odric, Lunarch Marshal, Selvala, Heart of the Wilds with Ulvenwald Tracker, Hammer of Purphoros with Fires of Yavimaya and maybe swap Lightning Greaves for Swiftfoot Boots as the Shroud is problematic at times.

I agree with the Emeria Angel swap as Shalai, Voice of Plenty is bonkers. also agree with the Lightning Greaves swap but the rest I'm not sure they are better, especially the The Immortal Sun. don't take that card out but if you do I want it lol

actually Rout for Fumigate all day. I'm changing that one too

Selvala, Heart of the Wilds only really benefits me to ramp into Zacama, Primal Calamity IF I have other big creatures out, and also will only really help me draw a card when I play my Commander. Where as Ulvenwald Tracker gives me versatility to remove threats through fighting instead of needing to use Zacama's burn ability a bunch. It is annoying to need 2 red available by turn 3 to reliably cast Hammer of Purphoros and since I really only want the haste ability (don't want to sac lands very often) the Fires of Yavimaya fits better in both color identity AND offering creature buff, even if for 1 turn only. Courser of Kruphix broadcasts my plays... even for the incremental lifegain, Zacama is already a big threat. Holding up my bombs for protection and what not are important. So letting everyone know what I got all the time I feel isn't as helpful as the lifegain/other abilities Odric, Lunarch Marshal can offer. I do like The Immortal Sun, but outside dropping it turn 5-6 it doesn't feel like I get enough value out of it. At least with Sunbird's Invocation I may get free spells. Worst case, I'll replace it with Atherflux Reservoir

Ended up swapping Emeria Angel > Shalai, Voice of Plenty, the Fumigate > Rout, the Selvala, Heart of the Wilds > Aetherflux Reservoir, the Courser of Kruphix > Odric, Lunarch Marshal, and Hammer of Purphoros > Fires of Yavimaya. Still unsure how to fit in Sunbird's Invocation and/or Ulvenwald Tracker.

Harmonize > Beast Whisperer , Krosan Grip > Knight of Autumn, Sylvan Library > Rhythm of the Savages, Oblivion Stone > ??

Oblivion Stone > runic armasaur

odric < goreclaw, serra ascendant < bruse tarl, mana vault < harrow, courser of kruphix < great henge?, beast whisperer < guardian project, atherflux < the immortal sun, samut < fiendish duo, comet storm < chaos warp, shalai < reya dawnbringer

Solemn < Exploration, Gorclaw < Zirda, Explosive veg < wildrness rec, emmeria < radha