Activate any number of other lands by tapping them, adding at least {4}{C}.
Activate Sylvan Safekeeper by sacrificing a land except Mirrorpool.
Repeat step 2 until you control no lands except Mirrorpool.
Activate Mirrorpool's third ability by paying {4}{C}, 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, Amulet of Vigor triggers that many times, untapping the lands.
Repeat.

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

Lumra, Bellow of the Woods

Mirrorpool

Amulet of Vigor

Sylvan Safekeeper

Activate any number of other lands by tapping them, adding at least {4}{C}.
Activate Sylvan Safekeeper by sacrificing a land except Mirrorpool.
Repeat step 2 until you control no lands except Mirrorpool.
Activate Mirrorpool's third ability by paying {4}{C}, 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 untapped due to Spelunking.
Repeat.

Infinite card draw

Infinite draw triggers

Spelunking

Cast Splendid Reclamation by paying {3}{G}.
Holding priority, activate any number of lands you control except Mirrorpool by tapping them, adding at least {2}{C}.
Activate Zuran Orb by sacrificing a land other than Mirrorpool.
Repeat step 3 until Mirrorpool is the only land you control.
Activate Mirrorpool's second ability by paying {2}{C}, tapping and sacrificing it, copying Splendid Reclamation.
Resolve the Splendid Reclamation copy, returning all land cards from your graveyard to the battlefield tapped.
When the lands enter, Amulet of Vigor triggers that many times, untapping the lands.
Repeat from step 2.

Infinite lifegain triggers

Infinite lifegain

Infinite magecraft triggers

Splendid Reclamation

Zuran Orb

Cast Splendid Reclamation by paying {3}{G}.
Holding priority, activate any number of lands you control except Mirrorpool by tapping them, adding at least {2}{C}.
Activate Zuran Orb by sacrificing a land other than Mirrorpool.
Repeat step 3 until Mirrorpool is the only land you control.
Activate Mirrorpool's second ability by paying {2}{C}, tapping and sacrificing it, copying Splendid Reclamation.
Resolve the Splendid Reclamation copy, returning all land cards from your graveyard to the battlefield untapped due to Spelunking.
Repeat from step 2.

Combos with "Mirrorpool"