Beifong's Bounty Hunters + Altar of Dementia + Down in the Valley

Beifong's Bounty Hunters

Altar of Dementia

Down in the Valley

How it works

1. Activate Altar of Dementia by sacrificing another nonland creature you control.
2. When the creature dies, Beifong's Bounty Hunters triggers, earthbending a land.
3. Resolve the Altar of Dementia ability.
4. Activate Altar of Dementia by sacrificing the land.
5. When the land dies, Beifong's Bounty Hunters triggers, returning the land from your graveyard to the battlefield tapped.
6. When the land enters, Down in the Valley triggers, creating a creature token.
7. Resolve the Altar of Dementia ability.
8. Repeat.