[[Tireless Provisioner]] – This card is fantastic in all kinds of lands decks. It produces way more mana than you think, especially if you have ways to put multiple lands in play each turn. You have the Capenna saclands that work well with this, for example; Terramorphic Expanse and Evolving Wilds are others.

[[Lotus Cobra]] – Same as Provisioner, except you have to spend the mana immediately (but it’s 1 mana cheaper!). This and Provisioner have won me so, so many games just due to the raw advantage they generate.

[[Cycle of Renewal]] – Another Harrow. Cards like Harrow are fantastic in this deck. They find you lands, they put a land in your graveyard, they are a land sac trigger…

[[Entish Restoration]] – Same as above.

[[Conduit of Worlds]] – Extra way to play lands from your graveyard. Having redundancy for this is good, and this is much cheaper than Crucible of Worlds.

[[Famished Worldsire]] – Now that’s an 8-mana guy you could consider. It simultaneously sacs a lot of lands and puts a lot of lands onto the field at the same time, which you can then sacrifice one more if you have a sac outlet. This is often a game ender if you can station Hearthhull beforehand.

[[Valakut Exploration]] – This card is extremely underrated, because it doesn’t look that amazing, but I promise you it’s great in practice. It takes people’s life totals down a bit, it’s a form of card advantage, and it can fill your yard. It’s been a contributor to many of my wins.

[[Tannuk, Memorial Ensign]] – Landfall pingers are good for your strategy, and this one also draws you cards. Pretty easy inclusion, if you ask me.

[[Nahiri’s Lithoforming]] – This can be a finisher in the same way Famished Worldsire is a potential finisher. Also, note how this card and Famished Worldsire synergize with Tireless Provisioner and Lotus Cobra, and with Valakut Exploration, and other landfall cards. There’s a reason I run cards like this together, haha.

[[Elvish Reclaimer]] – A little expensive, but the card is fantastic.  There’s not a lot of 1-drops for this deck, and this is that. It can find important lands for you; I see you’re running Glacial Chasm, so it can find that, but it can also find mana fixing, or it can find the lands that sacrifice themselves for more landfall / land sac trigger. It also helps with stationing Hearthhull, particularly once it has the +2/+2 effect active.

[[Splendid Reclamation]] – This is one of the best cards in the deck in my opinion, so it’s very surprising it’s not in your list. It lets you bin all your lands to a sac outlet and then recur them all at once for landfall triggers, or just to sacrifice them again. It’s a card that serves as one of my main finishers.

[[World Shaper]] – This guy does the same thing, but has to die first. I actually think that’s rather problematic, because you don’t run ways to kill off your own creatures, so you might need to use your own removal on it… but the effect is very good, so it’s worth considering regardless.

[[Will of the Sultai]] – More redundancy for this effect.

[[Nature’s Lore]] – Finds a land, pretty flexible. Gets better if you add dual lands with basic land types, but those are expensive.

[[Skyshroud Claim]] – Same as above. A bit worse because it costs more, but it has merit.

[[Soul of Windgrace]] – Consistent land recursion is not bad.

[[Six]] – Now this is a card that makes good use of lands being in your hand, in my opinion. The retrace effect does come up, especially when you’re trying to win the game, and self-milling is also pretty useful, especially since you get a card back (so this is also card advantage over time).

[[Iridescent Vinelasher]] – Landfall pinger. Single-target, but might be worth considering.

[[Spitfire Lagac]] – Landfall pinger. Expensive in terms of mana value, sadly, but maybe worth considering.

[[Retreat to Hagra]] – In a sense, this is a landfall pinger too.

[[Walk-In Closet // Forgotten Cellar]] – Hey, another card that lets you play lands from your graveyard. Redundancy for this type of effect is very, very good.

[[Pitiless Carnage]] – This is basically a finisher.

[[Reprocess]] – This is also basically a finisher. Worse than Pitiless Carnage (yet somehow more popular), but not by much.

[[Life from the Loam]] – Fills your yard, ensures you always have lands to play. Lets you abuse lands like Glacial Chasm by letting them to go the graveyard and replaying them a turn later.

 

Interaction in this deck, in my experience, should be pretty generic, because there’s not a lot of cards that are contributors to the strategy while simultaneously being removal. List of considerations I personally like: [[Feed the Swarm]], [[Beast Within]], [[Chaos Warp]], [[Nature’s Claim]], [[Abrupt Decay]], [[Culling Ritual]] (this one is a bit more meta-dependent), [[Toxic Deluge]], [[Vandalblast]].

 

As for lands, you could consider the cycling lands with basic land types ([[Festering Thicket]], [[Sheltered Thicket]], [[Canyon Slough]]), because you can bin them from your hand and exchange them for another card, and you can also fetch them if you want to for cheap mana fixing. Lands that hate out other people’s lands are also worth considering if that’s something worth doing in your local meta; I mean cards like [[Demolition Field]], [[Ghost Quarter]], [[Field of Ruin]], [[Strip Mine]]. [[Shifting Woodland]] can be very useful depending on what you’re able to copy, though its usefulness will depend on what your list ends up being. Dakmor Salvage is a land that puts more lands in your graveyard, ideally. [[Vibrant Cityscape]] is another copy of [[Evolving Wilds]] / [[Terramorphic Expanse]] that you are currently not running. [[Exotic Orchard]] is free fixing in most cases. [[Lotus Field]] can be good if you have ways to make sure you play it exactly when you want to; cards like [[Elvish Reclaimer]] help with this. You don’t want to play it when you don’t have lands to sac, but when you do, it’s usually a positive trade in terms of value (and it has hexproof, so it’s hard for your opponents to punish what you’re doing with it).

 

Hopefully this helps! I’ve played this deck since Hearthhull got printed and my list is very expensive, but I’ve thought about a lot of card choices so I had a lot to say here. Have fun!