Consider:
Another land?
* Nevinyrral's Disk - Sweeper that lets Windgrace live
* Bala Ged Recovery - Regrowth that can double as a land if I really need one
Ignoble Hierarch - Turn one ramp
Orcish Lumberjack - Ramp and land sac outlet
Decree of Pain - Sweep the board and find a way to start closing out the game
Moraug, Fury of Akoum - More combats
Deadly Tempest - Sweeper that can also move towards an end of the game
In Garruk's Wake / Plague Wind - One-sided sweepers
Tear Asunder
Valakut, the Molten Pinnacle - Can do a lot of work when I have Dryad of the Ilysian Grove out, especially when paired with Scapeshift, but pretty dead without the Dryad
Timeless Witness
Reap the Past
Valakut Awakening - Card draw
Beast Within - Strong, flexible removal if I have extra copies
Stone-Seeder Hierophant - A more expensive Lotus Cobra
Nissa, Who Shakes the World
Khalni Heart Expedition
Living Twister
Broken Bond
Sakura-Tribe Scout, Llanowar Scout
Vandalblast
Deathsprout
Thaumatic Compass
Tooth and Nail - Find Omnath and Titania/Gitrog
Blackblade Reforged
Scute Mob, Dragonmaster Outcast - Cheap threats that synergize with lands
Deathrite Shaman - Early play that can ramp, hate on graveyards and utilize milled instants and sorceries
Rubblehulk - Pretty much worthless except as a finisher, only deals with one player at most and can be stopped by chump blockers. However, it's very hard to interact with if I can bloodrush this at an opportune moment, and in this deck it's almost guaranteed to do a lot of damage if it connects
Expedition Map - Probably don't need this with all the green land stuff
Rude Awakening
Blasphemous Act - Cheap board wipe
Toxic Deluge/Damnation - Cheap board wipes, but double black and costing life might be a bit difficult
Terminate - Cheap removal
Migration Path - Strict upgrade to Explosive Vegetation
Explosive Vegetation
Journey of Discovery - Get a couple of lands to pitch to Windgrace and/or drop some good lands when I'm out of land drops. Too expensive as just an Explosive Vegetation, though
Reap and Sow - Land destruction and/or tutor
Retreat to Kazandu - Lifegain or grow a threat, but I don't really have a lot of counters synergy
Horn of Greed - I'm probably playing more lands than everyone else, but I probably don't want to give the others the draws
Sylvan Scrying, Tempt with Discovery - This deck is more about quantity than quality, and finding specific lands might not be as important

Rebuild the City - Copy a Field of the Dead, Bojuka Bog, or even an opponent's Cabal Coffers
$$$$ Boseiju, Who Endures
$$$$ Nissa, Resurgent Animist
$$$ Titania, Voice of Gaea + Argoth, Sanctum of Nature - Meld awesomeness
$$$ Cultivator Colossus
Rebuild the City
$$ Ashaya, Soul of the Wild
$$ Augur of Autumn
$$ Nesting Dragon
Blood on the Snow - Flexible sweeper
Phylath, World Sculptor - Worse without Avenger of Zendikar, but can create a bunch of blockers and subsequently make them dangerous
Waking the Trolls - Destroy a land, ramp a bit, then potentially get a bunch of big trolls

Lands:
Rakdos Carnarium
Blood Crypt
* Bloodstained Mire

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Considered cuts (lands):
Ghost Quarter
Kessig Wolf Run - Mostly there for Radha

Considered cuts:
Grapple with the Past - Can save an important land or creature from the graveyard
Druid Class - The life gain is nice, but it costs 5 mana before it does what I really want, which is extra land drops
Squandered Resources - Move to Muldrotha?
Worm Harvest - I need to have lands in hand to use this (more than once), at least 5 mana to spare, and a good amount of lands in the yard
Decimate - Don't always have all targets when I need this
Evolution Sage - I don't have that many planeswalkers, so I might rarely get the value off this
Putrefy - Not sure how much spot removal I need, but this has a pretty decent balance of flexibility and cost
Wayward Swordtooth - It's just a 3 mana Exploration, basically
Multani - Boring, but reach and trample is nice
Retreat to Hagra - Too minor?
Courser of Kruphix - The lifegain is nice, and seeing my top card is useful with a lot of fetches, but is it worth 3 mana?
Windgrace's Judgment - 5 mana is a lot, but it's very flexible
World Shaper - Don't have a lot of sac outlets
Scapeshift - Pretty good with both Titania and Omnath, but is it worth it without Valakut? Great to follow up with a Splendid Reclamation

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Cuts (lands):
Inkmoth Nexus - I have enough other wincons that I don't need this
Dust Bowl - Too expensive to use, and Wasteland + GQ should be enough
High Market - Too many colorless lands? World Shaper is the only thing I really want to sac
Vesuva - What land am I going to copy that I really need this? Someone else's Cabal Coffers?
Myriad Landscape - ETBT and colorless, and I probably have enough other sources of ramp
Savage Lands - Always enters tapped, and has no upside beyond fixing
Jund Panorama - Slow, and saccing actually costs mana. Probably not worth it even with the double triggers

Cuts:
Ruinous Path - The awaken cost is pretty high for not a lot, and in that case, this card just does too little
Chain Reaction - I have the mana and colors to cast the sweepers I can control better
The Elderspell - Getting a bunch of counters on Windgrace is actually not amazing, and Bolas needs this
? Centaur Vinecrasher - The recursion is nice, but I'm unlikely to get much help from others to grow this. Gets better with Evolution Sage
Seer's Sundial - Kind of expensive to pay for the card draw, and it's an artifact
Krosan Grip - Generic removal that can be played elsewhere
Sprouting Vines - I only ever want to cast this if I know I can discard with Windgrace for multiple turns, or have a Borborygmos ready
? Yavimaya Elder - I probably won't have that many basics left in the deck, and this is pretty expensive to use for a small reward. Note: Lands to hand helps with Windgrace discard and extra land drops
Savage Twister
Borborygmos - Very expensive to cast, and I probably don't want to throw all my lands. Works best as a finisher when I have Zuran Orb/Squandered Resources and know I can resolve Creeping Renaissance
Tectonic Reformation - I'm somewhat short on red mana and I want as many lands as possible anyway
Turntimber Sower - Not as good without Avenger of Zendikar to grow the plants/generate additional plants
Genesis Wave - No interaction with lands, and I have too many spells and not enough impactful permanents for this to be worth it
? Zendikar's Roil - Elementals for Omnath is nice, and so is blockers, but it might not be worth 5 mana. Need at least 3-4 triggers for it to be decent, and if I can't make multiple land drops it's unlikely to pay for itself in reasonable time
? Subterranean Tremors - Has nothing to do with either lands or Jund, only that it becomes better when more mana is available. Might want this anyway since I don't play mana artifacts
Far Wanderings - The worst of the ramp cards. It's great if I have threshold, but I'm unlikely to have that early when this is most important
Creeping Renaissance - How often do I want to spend this amount of mana to get one type of card from my graveyard? I probably rarely want to have all the lands in my hand, and I'll probably just have to discard most again
Sylvan Awakening - If this was instant speed I could use it in response to removal or an attack, but when it can only be used as a win condition it might not be worth it. However, with Omnath and a sac outlet I could use it to get a lot of reach
Nylea's Intervention - Only fetches to hand and can only deal with fliers, and neither at a great rate
Budoka Gardener - No trample or evasion on the tokens, so they are probably not worth 6 mana each
Ulvenwald Hydra - No trample, but it can get Wolf Run to give itself trample
Hour of Promise - Five mana for two lands isn't a great rate, but it can get ANY lands. Quantity over quality, though
Nissa, Vastwood Seer - Gets me a forest then draws a card, then gets killed
Explore - Cantrip that can also let me drop some extra lands from land heavy hands, but it also risks doing nothing
Praetor's Counsel - Very expensive, but the no max hand size might make it worth it. I probably won't be able to cast anything relevant on the same turn
Gaze of Granite - Expensive to use, and besides killing mana rocks, it has no special synergy with our deck
? Skyshroud Claim - Four mana ramp might be a bit much, but it does put the lands in untapped and get duals
Lavalanche - Somewhat inefficient as a boardwipe and I prooobably don't need the targeted burn. A black hard sweeper is probably better
Sylvan Safekeeper - Might be more useful for Muldrotha. Traded away
Casualties of War - This is a lot of mana for spot removal, even if it gets a lot of targets
Burgeoning - Can get me a fast start, but I probably have enough other extra land drops that I don't really need this since it can also be a completely dead draw if I am land light and ramp heavy
? Dig Up - I only really want this for the Diabolic Tutor, which is a bit too expensive. The emergency mode is nice though
Radha, Heart of Keld - No evasion, and 6 mana to make her a threat is a bit much
Grisly Salvage - A strong cantrip giving me some selection while also potentially putting more lands in the graveyard for later use
The Mending of Dominaria - Too slow/telegraphy?
Torment of Hailfire - A great but boring place to sink mana into. Need my copies in mono black and Bolas
? Roiling Regrowth - Upgraded to Entish Restoration