Beifong's Bounty Hunters + Gravecrawler + Stone-Seeder Hierophant + Yahenni, Undying Partisan

Beifong's Bounty Hunters

Gravecrawler

Stone-Seeder Hierophant

Yahenni, Undying Partisan

How it works

1. Activate Yahenni 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 Yahenni ability.
4. Activate Yahenni 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, Stone-Seeder Hierophant triggers, untapping it.
7. Holding priority, activate Stone-Seeder Hierophant by tapping it, untapping the land.
8. Resolve the Yahenni ability.
9. Activate the land by tapping it, adding at least .
10. Cast Gravecrawler from your graveyard by paying .
11. Repeat.