Beifong's Bounty Hunters + Gravecrawler + Altar of Dementia + Amulet of Vigor

Beifong's Bounty Hunters

Gravecrawler

Altar of Dementia

Amulet of Vigor

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, Amulet of Vigor 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.

This clever recursive loop turns your graveyard into an engine by cycling Gravecrawler over and over with the help of Altar of Dementia. Because Gravecrawler can be cast straight from the graveyard as long as you control another Zombie, sacrificing it to Altar of Dementia fuels the exact mana you need to pay for it using a land animated by Beifong's Bounty Hunters. Whenever that land is sacrificed to the Altar or perishes, Beifong's Bounty Hunters immediately returns it to the battlefield tapped, where Amulet of Vigor steps in to instantly untap it and ready it for mana production once again.