Food Chain + Lumra, Bellow of the Woods + Command Beacon + Spelunking

Food Chain

Lumra, Bellow of the Woods

Command Beacon

Spelunking

How it works

1. Activate Food Chain by exiling Lumra, adding seven that can only be spent to cast creature spells.
2. Choose to return Lumra to the command zone from exile.
3. Activate Command Beacon's second ability by tapping and sacrificing it, putting Lumra from the command zone into your hand.
4. Cast Lumra by paying 4.
5. When Lumra enters, it triggers, causing you to mill four cards and return all land cards from your graveyard to the battlefield untapped due to Spelunking.
6. Repeat.

This loop transforms the legendary bear Lumra, Bellow of the Woods into an unstoppable engine by leveraging Food Chain to repeatedly exile and recast it for a profit of mana. Because Command Beacon lets you bypass exile and return your commander straight to your hand after each sacrifice, you can continually pay Lumra's casting cost. Meanwhile, Spelunking ensures that every land brought back by Lumra's entry trigger enters the battlefield untapped, allowing you to easily rebuild and fuel your resources alongside whatever lands Command Beacon helped fetch.