Upgrade the mana base to be filled with Fetch Lands
Cuts:Pest Infestation
Juri, Master of the Revue
Mayhem Devil
Binding the Old Gods
Braids, Arisen Nightmare
Rampaging Baloths
Satyr Wayfinder
Sprouting Goblin
Aftermath Analyst
Night's Whisper
The first cut today is Pest Infestation, a sorcery that allows us to destroy a bunch of artifacts and enchantments to create a lot of 1/1 Pest tokens. It's a good card, but we're really aiming for land shenanigans here. The same sentiment is true for Juri, Master of the Revue and Mayhem Devil, which are being cut to make more room for land synergies. There's a case to keep Mayhem Devil in if you really want to lean into the sacrifice theme with lands, but we're looking for a bit more consistency with returning lands to the battlefield.
Binding the Old Gods is a good "does a bit of everything" card, but it's a bit slow for what we're looking to do, even though it can search us up a Forest card when the second chapter resolves. Braids, Arisen Nightmare lets us sacrifice a bunch of things and forces our opponents to do the same, but it's also a bit slow comparatively. Rampaging Baloths has been a long-time win condition for various Landfall strategies, but it's suited better for Token strategies rather than this one. Satyr Wayfinder does some amount of milling, which we'll want with Hearthhull at the helm. There are much better cards that do this, so we're cutting it.

Sprouting Goblin is definitely thematic with what we're looking to do here since the Goblin can sacrifice lands in exchange for more cards, but we can find better options (such as our Commander). Then there's Aftermath Analyst, a two-mana card that can help us return a bunch of lands in our graveyard to the battlefield, but we already have a few cards that achieve this already and are better. Finally, Night's Whisper is a two-mana sorcery that lets us draw two cards and lose two life. We have so much card draw, so it's outta here.

Adds:
With the cuts identified, let's take a look at the cards we'll be adding to the deck.

Lord Windgrace
Zask, Skittering Swarmlord
Lotus Cobra
Sylvan Safekeeper
Zuran Orb
Elvish Reclaimer
Springheart Nantuko
Mossborn Hydra
Awaken the Woods
Will of the Sultai
As it turns out, ramp is good! Which is why we'll be adding Lotus Cobra to the mix to ensure we can have small bursts of mana to cast more spells. Sylvan Safekeeper is one of the more powerful additions to the deck, as it'll let us sacrifice a land to give a creature Shroud until the end of the turn. The Safekeeper is a pretty incredible way to protect our creatures; however, you (as in the player) cannot target any of your shrouded creatures with any spells or abilities!
Zask, Skittering Swarmlord is one of the few cards that'll help us return land cards to the graveyard to help fuel Hearthhull's second ability. Zask is also an Insect, meaning you'll gain some passive value if you happen to have any Insects on the battlefield (which the World Shaper Deck has a few), as being able to grant deathtouch in a pinch will have its uses in combat. Elvish Reclaimer is another way to churn through our mana base as you can sacrifice a land to find any land card from the library and put it into play tapped. The Reclaimer also gets a minor boost if there's enough land cards in your graveyard, pulling itself out of Lightning Bolt range.

Springheart Nantuko is one of the many silly cards from Modern Horizons 3, which comes with Landfall and Bestow. Bestow makes this really interesting, as if you attach the Nantuko to a creature you control and then play a land card (which triggers Landfall), you're able to create a copy of that creature for one green mana. This can get out of hand pretty quickly, but as a worst-case scenario, you can also make a bunch of Insect tokens instead with Springheart Nantuko just being in play without Bestow-ing anything (which also happens to work well alongside Zask, Skittering Swarmlord).

Zuran Orb is one of the best ways to sacrifice land cards at the cost of zero mana, and is perhaps the best addition you can make to support Hearthhull, the Worldseed. With the Zuran Orb in play and Hearthhull fully activated, you're able to force each opponent to lose two life (and you gain two life) for each land you sacrifice. This is a win condition in itself. Another way to make the most of our mana is Lord Windgrace, who comes with a mix of effects to draw more cards, return land cards, and keep the board clear of nonland permanents (and make some Cat Warrior tokens) in the process. Lord Windgrace isn't the most exciting addition, but provides more utility compared to Binding the Old Gods.
Will of the Sultai is an underrated card from Commander: Tarkir: Dragonstorm, but it fits really well with our need to return a bunch of lands to the battlefield to re-sacrifice with Zuran Orb or Hearthhull. In most cases, you'll be able to choose both modes and use the second option as a backup in case the primary game plan doesn't quite work out. And if you need somewhere to throw those +1/+1 counters, Mossborn Hydra is probably one of our favorite ways to close out games. Whenever a land enters play under your control, you double the number of +1/+1 counters on the Hydra. It comes in play with a +1/+1 to kick things off, but this can also spiral out of control pretty quickly with trample boasting a ton of damage.

Our final update is Awaken the Woods, which lets us create X Forest Dryad tokens that also happen to be lands. Even though these are creatures, they each trigger Landfall as well. If you're in a position with a decent enough board state, this could lead to the game ending pretty quickly (and efficiently).

https://www.tcgplayer.com/content/article/Edge-of-Eternities-World-Shaper-MTG-Commander-Deck-Upgrade-Guide/974c7b64-6e98-4b0e-ae8b-2710120f09ed/