Beifong's Bounty Hunters + Gravecrawler + Altar of Dementia + Tiller Engine

Beifong's Bounty Hunters

Gravecrawler

Altar of Dementia

Tiller Engine

How it works

1. Activate Altar of Dementia by sacrificing Gravecrawler.
2. When Gravecrawler dies, Beifong's Bounty Hunters triggers, earthbending a land that can tap to produce at least .
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, Tiller Engine triggers, untapping the land.
7. Resolve the Altar of Dementia ability.
8. Activate the land by tapping it, adding at least .
9. Cast Gravecrawler from your graveyard by paying .
10. Repeat.