Lumra, Bellow of the Woods, Mirrorpool, Thaumatog, and Tiller Engine

Prerequisites

• Lumra, Bellow of the Woods on the battlefield
• Mirrorpool on the battlefield
• Thaumatog on the battlefield
• Tiller Engine on the battlefield

Steps

1. Activate any number of other lands by tapping them, adding at least
2. Activate Thaumatog by sacrificing a land except Mirrorpool
3. Repeat step 2 until you control no lands except Mirrorpool
4. Activate Mirrorpool's third ability by paying , tapping and sacrificing it, creating a token copy of Lumra
5. Put the Lumra token into your graveyard due to the legend rule
6. 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
7. When the lands enter the battlefield, Tiller Engine triggers that many times, untapping the lands
8. Repeat

Results

• Infinite ETB
• Infinite death triggers
• Infinite self-mill
• Infinite mana lands you control can produce
• Infinite landfall triggers
• Infinitely large Thaumatog until end of turn
• Put all land cards from your library and graveyard onto the battlefield