Toph, the First Metalbender | Springheart Nantuko

Cards

All permanents on the battlefield (
Stone-Seeder Hierophant without summoning sickness).

You have a land card in hand.
You control a land that enters untapped and that can tap to produce at least ({1} magic symbol) .
You control a land that can tap to produce at least ({G} magic symbol) .

At the beginning of your end step,
Toph triggers, animating a land you control that enters the battlefield untapped.
During your next turn, cast
Springheart Nantuko for its bestow cost by paying ({1} magic symbol) ({G} magic symbol) , attaching it to an animated land.
Play a land. When the land enters,
Springheart Nantuko triggers, causing you to pay ({1} magic symbol) ({G} magic symbol) to create a copy of the land it is attached to.
When the land token enters,
Springheart Nantuko and
Stone-Seeder Hierophant trigger.
Resolve the
Stone-Seeder Hierophant trigger, untapping it.
Holding priority, activate the land token by tapping it, adding at least ({1} magic symbol) .
Activate
Stone-Seeder Hierophant by tapping it, untapping a land.
Activate a land by tapping it, adding at least ({G} magic symbol) .
Resolve the
Springheart Nantuko trigger, causing you to pay ({1} magic symbol) ({G} magic symbol) to create a copy of the land it is attached to.
Repeat from step 4.

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