Lumra, Bellow of the Woods + Mirrorpool + The Wandering Minstrel + Trenching Steed

WUBRG identity

Commander legal

The 4 combo pieces

• Lumra, Bellow of the Woods
• Mirrorpool
• The Wandering Minstrel
• Trenching Steed

How to execute it

1. Activate any number of other lands by tapping them, adding at least {4}{C}.
2. Activate Trenching Steed 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 {4}{C}, 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 untapped due to The Wandering Minstrel.
7. Repeat.

What the combo produces

• Infinite death triggers
• Infinite ETB
• Infinite landfall triggers
• Infinite mana lands you control can produce
• Infinite self-mill
• Put all land cards from your library and graveyard onto the battlefield