Other lands you control can tap to produce at least ({4} magic symbol) ({C} magic symbol) .
Notable Prerequisites
Stone-Seeder Hierophant does not have summoning sickness.
Steps
Activate any number of other lands by tapping them, adding at least ({4} magic symbol) ({C} magic symbol) .
Activate
Troubled Healer by sacrificing a land except
Mirrorpool.
Repeat step 2 until you control no lands except
Mirrorpool.
Activate
Mirrorpool's third ability by paying ({4} magic symbol) ({C} magic symbol) , tapping and sacrificing it, creating a token copy of
Lumra.
Put the
Lumra token into your graveyard due to the legend rule.
The
Lumra token's enters-the-battlefield ability triggers, causing you to mill four cards and return all land cards from your graveyard to the battlefield tapped.
When the lands enter the battlefield,
Stone-Seeder Hierophant triggers that many times.
Resolve the first trigger, untapping
Stone-Seeder Hierophant.
Holding priority, activate
Stone-Seeder Hierophant by tapping it, untapping a land.
Repeat from step 8 for the remaining triggers.
Repeat from step 1.
Results
Infinite ETB.
Infinite death triggers.
Infinite self-mill.
Infinite mana lands you control can produce.
Infinite landfall triggers.
Put all land cards from your library and graveyard onto the battlefield.