Play a land.
When the land enters, Springheart Nantuko triggers, causing you to pay {1}{G} to create a token copy of Springbloom Druid.
When the Springbloom Druid token enters, it triggers, causing you to sacrifice a land, then search your library for a basic Forest and another basic land and put them onto the battlefield untapped due to Spelunking 
When the basic lands enter, Springheart Nantuko triggers twice.
Holding priority, activate both lands by tapping them, adding {1}{G}.
Resolve the first Springheart Nantuko trigger, choosing not to pay and creating a 1/1 Insect creature token.
Resolve the second Springheart Nantuko trigger, causing you to pay {1}{G} to create a token copy of Springbloom Druid.
Repeat from step 3 until your library contains no basic lands.

Near-infinite creature ETB

Near-infinite creature tokens

Near-infinite landfall triggers

Put all basic lands from your library onto the battlefield tapped

Springbloom Druid

Springheart Nantuko

Spelunking

Play a land.
When the land enters, Springheart Nantuko triggers, causing you to pay {1}{G} to create a token copy of Springbloom Druid.
When the Springbloom Druid token enters, it triggers, causing you to sacrifice a land, then search your library for a basic Forest and another basic land and put them onto the battlefield untapped due to Horizon Explorer 
When the basic lands enter, Springheart Nantuko triggers twice.
Holding priority, activate both lands by tapping them, adding {1}{G}.
Resolve the first Springheart Nantuko trigger, choosing not to pay and creating a 1/1 Insect creature token.
Resolve the second Springheart Nantuko trigger, causing you to pay {1}{G} to create a token copy of Springbloom Druid.
Repeat from step 3 until your library contains no basic lands.

Horizon Explorer

Play a land.
When the land enters, Springheart Nantuko triggers, causing you to pay {1}{G} to create a token copy of Springbloom Druid.
When the Springbloom Druid token enters, it triggers, causing you to sacrifice a land, then search your library for a basic Forest and another basic land and put them onto the battlefield tapped.
When the Forest and other basic land enter, Amulet of Vigor and Springheart Nantuko trigger twice.
Resolve both Amulet of Vigor triggers, untapping the basic lands.
Holding priority, activate both lands by tapping them, adding {1}{G}.
Resolve the first Springheart Nantuko trigger, choosing not to pay and creating a 1/1 Insect creature token.
Resolve the second Springheart Nantuko trigger, causing you to pay {1}{G} to create a token copy of Springbloom Druid.
Repeat from step 3 until your library contains no basic lands.

Amulet of Vigor

Play a land.
When the land enters, Springheart Nantuko triggers, causing you to pay {1}{G} to create a token copy of Springbloom Druid.
When the Springbloom Druid token enters, it triggers, causing you to sacrifice a land, then search your library for a basic Forest and another basic land and put them onto the battlefield tapped.
When the Forest and other basic land enter, Tiller Engine and Springheart Nantuko trigger twice.
Resolve both Tiller Engine triggers, untapping the basic lands.
Holding priority, activate both lands by tapping them, adding {1}{G}.
Resolve the first Springheart Nantuko trigger, choosing not to pay and creating a 1/1 Insect creature token.
Resolve the second Springheart Nantuko trigger, causing you to pay {1}{G} to create a token copy of Springbloom Druid.
Repeat from step 3 until your library contains no basic lands.

Tiller Engine

Play a land.
When the land enters, Springheart Nantuko triggers, causing you to pay {1}{G} to create a token copy of Springbloom Druid.
When the Springbloom Druid token enters, it triggers, causing you to sacrifice a land, then search your library for two basic lands and put them onto the battlefield tapped.
When the Forest and other basic land enter, Stone-Seeder Hierophant and Springheart Nantuko trigger twice.
Resolve a Stone-Seeder Hierophant trigger, untapping it.
Holding priority, activate Stone-Seeder Hierophant by tapping it, untapping a land that can tap to produce {G}.
Activate the land by tapping it, adding at least {G}.
Repeat steps 5 through 7 for the remaining Stone-Seeder Hierophant trigger.
Resolve the first Springheart Nantuko trigger, choosing not to pay and creating a 1/1 Insect creature token.
Resolve the second Springheart Nantuko trigger, causing you to pay {1}{G} to create a token copy of Springbloom Druid.
Repeat from step 3 until your library contains no basic lands.

Stone-Seeder Hierophant

Play a land.
When the land enters, Springheart Nantuko triggers, causing you to pay {1}{G} to create a token copy of Springbloom Druid.
When the Springbloom Druid token enters, it triggers, causing you to sacrifice a land, then search your library for a basic Forest and another basic land and put them onto the battlefield untapped due to Archelos 
When the basic lands enter, Springheart Nantuko triggers twice.
Holding priority, activate both lands by tapping them, adding {1}{G}.
Resolve the first Springheart Nantuko trigger, choosing not to pay and creating a 1/1 Insect creature token.
Resolve the second Springheart Nantuko trigger, causing you to pay {1}{G} to create a token copy of Springbloom Druid.
Repeat from step 3 until your library contains no basic lands.

Archelos, Lagoon Mystic

Play a land.
When the land enters, Springheart Nantuko triggers, causing you to pay {1}{G} to create a token copy of Springbloom Druid.
When the Springbloom Druid token enters, it triggers, causing you to sacrifice a land, then search your library for a basic Forest and another basic land and put them onto the battlefield untapped due to The Wandering Minstrel 
When the basic lands enter, Springheart Nantuko triggers twice.
Holding priority, activate both lands by tapping them, adding {1}{G}.
Resolve the first Springheart Nantuko trigger, choosing not to pay and creating a 1/1 Insect creature token.
Resolve the second Springheart Nantuko trigger, causing you to pay {1}{G} to create a token copy of Springbloom Druid.
Repeat from step 3 until your library contains no basic lands.

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