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 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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