Play Simic Growth Chamber.
When Simic Growth Chamber enters the battlefield, it, Sapling Nursery, and Kodama of the East Tree trigger.
Resolve the Kodama of the East Tree trigger, choosing not to put anything from your hand onto the battlefield.
Resolve the Simic Growth Chamber trigger, returning it from the battlefield to your hand.
Resolve the Sapling Nursery trigger, creating a token.
When the token enters the battlefield, Kodama triggers, putting Simic Growth Chamber from your hand onto the battlefield.
When Simic Growth Chamber enters the battlefield, it and Sapling Nursery trigger.
Repeat from step 4.

Infinite ETB

Infinite creature tokens

Infinite landfall triggers

Kodama of the East Tree

Simic Growth Chamber

Sapling Nursery

Activate Perilous Forays by paying {1} and sacrificing a creature, causing you to search your library for a land card with a basic land type and put it onto the battlefield tapped.
When the land enters the battlefield Tireless Provisioner and Sapling Nursery trigger.
Resolve the Tireless Provisioner trigger, creating a Treasure token.
Activate the Treasure by tapping and sacrificing it, adding {1}.
Resolve the Sapling Nursery trigger, creating a creature token.
Repeat.

Put all lands with a basic land type from your library onto the battlefield tapped

Perilous Forays

Tireless Provisioner

Activate Perilous Forays by paying {1} and sacrificing a creature you control, searching your library for a land card with a basic land type and putting it on the battlefield untapped due to Spelunking.
When the land enters the battlefield, Sapling Nursery triggers, creating a creature token.
Activate the land by tapping it, adding {1}.
Repeat.

Spelunking

Activate Wight of the Reliquary by tapping it and sacrificing another creature, causing you to search your library for a land card and put it onto the battlefield tapped.
When the land enters the battlefield, Sapling Nursery and Retreat to Coralhelm trigger.
Resolve the Sapling Nursery trigger, creating a creature token.
Resolve the Retreat to Coralhelm trigger, untapping Wight of the Reliquary.
Repeat.

Near-infinite landfall triggers

Put all lands from your library onto the battlefield tapped

Wight of the Reliquary

Retreat to Coralhelm

Activate Viscera Seer by sacrificing another nonland creature you control.
When the creature dies, Beifong's Bounty Hunters triggers, earthbending a land.
Resolve the Viscera Seer ability.
Activate Viscera Seer by sacrificing the land.
When the land dies, Beifong's Bounty Hunters triggers, returning the land from your graveyard to the battlefield tapped.
When the land enters, Sapling Nursery triggers, creating a creature token.
Resolve the Viscera Seer ability.
Repeat.

Infinite LTB

Infinite death triggers

Infinite sacrifice triggers

Infinite scry 1

Beifong's Bounty Hunters

Viscera Seer

Activate Perilous Forays by paying {1} and sacrificing a creature, causing you to search your library for a land card with a basic land type and put it onto the battlefield tapped.
When the land enters the battlefield, Sapling Nursery triggers, creating a creature token.
Activate Earthcraft by tapping the creature token, untapping a basic land.
Activate the land by tapping it, adding {1}.
Repeat.

Put all lands with a basic land type from your library onto the battlefield

Earthcraft

Activate Squandered Resources by sacrificing a land, adding one mana of any color that land could produce.
Repeat step 1 until you have at least {4}{B}{G} available and/or you control no other mana-producing lands.
Activate Aftermath Analyst by paying {3}{G} and sacrificing it, returning all land cards from your graveyard to the battlefield tapped.
When the lands enter the battlefield, Sapling Nursery triggers that many times, creating that many creature tokens.
Activate Chthonian Nightmare by paying {E}{E}, sacrificing a creature and returning Chthonian Nightmare from the battlefield to your hand, returning Aftermath Analyst from your graveyard to the battlefield.
When Aftermath Analyst enters the battlefield, it triggers, causing you to mill three cards.
Cast Chthonian Nightmare by paying {1}{B}.
When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
Repeat.

Infinite energy counters

Infinite mana lands you control can produce

Infinite self-mill

Infinite storm count

Put all land cards from your library and graveyard onto the battlefield

Squandered Resources

Aftermath Analyst

Chthonian Nightmare

Activate Wight of the Reliquary by tapping it and sacrificing another creature, causing you to search your library for a land card and put it onto the battlefield tapped.
When the land enters the battlefield, Sapling Nursery triggers, creating a creature token.
When the creature token enters the battlefield, Intruder Alarm triggers, untapping all creatures.
Repeat.

Intruder Alarm

Activate Perilous Forays by paying {1} and sacrificing a creature.
When the creature dies, Pitiless Plunderer triggers, creating a Treasure token.
Resolve the Perilous Forays ability, causing you to search your library for a land card with a basic land type and put it onto the battlefield tapped.
When the land enters the battlefield, Sapling Nursery triggers, creating a creature token.
Activate the Treasure by tapping and sacrificing it, adding {1}.
Repeat.

Pitiless Plunderer

Activate Ashnod's Altar by sacrificing Ashaya, adding {C}{C}.
When Ashaya dies, Nim Deathmantle triggers, causing you to pay {4} to return Dryad Arbor from your graveyard to the battlefield, and attaching Nim Deathmantle to it.
When Ashaya enters the battlefield, Sapling Nursery triggers, creating a creature token.
Activate Ashnod's Altar by sacrificing the creature token, adding {C}{C}.
Repeat.

Infinite colorless mana

Infinite green mana

Nim Deathmantle

Ashnod's Altar

Ashaya, Soul of the Wild

Activate Ashnod's Altar by sacrificing Dryad Arbor, adding {C}{C}.
When Dryad Arbor dies, Nim Deathmantle triggers, causing you to pay {4} to return Dryad Arbor from your graveyard to the battlefield, and attaching Nim Deathmantle to it.
When Dryad Arbor enters the battlefield, Sapling Nursery triggers, creating a creature token.
Activate Ashnod's Altar by sacrificing the creature token, adding {C}{C}.
Repeat.

Combos with "Sapling Nursery"