Springbloom Druid | Springheart Nantuko

Cards

All permanents on the battlefield (
Springheart Nantuko attached to
Springbloom Druid and
Stone-Seeder Hierophant without summoning sickness).

You have a land card in hand.
You are able to play a land this turn.
You control a land that can tap to produce at least ({G} magic symbol) and/or have a basic Forest in your library.

Play a land.
When the land enters,
Springheart Nantuko triggers, causing you to pay ({1} magic symbol) ({G} magic symbol) 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} magic symbol) .
Activate the land by tapping it, adding at least ({G} magic symbol) .
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} magic symbol) ({G} magic symbol) to create a token copy of
Springbloom Druid.
Repeat from step 3 until your library contains no basic lands.

If you don't control a land that can produce ({G} magic symbol) to start, you must grab a basic Forest the first iteration alongside any other land. While you will put all basic lands onto the battlefield, you'll have to sacrifice half of them to continue the combo. This won't affect how many landfall triggers, ETB triggers and creature tokens you get however.

This combo has been estimated to be Exhibition (Bracket 1+).