Beifong's Bounty Hunters + Spawning Pit + Dragonback Assault

Beifong's Bounty Hunters

Spawning Pit

Dragonback Assault

How it works

1. Activate Spawning Pit by sacrificing another nonland creature you control.
2. When the creature dies, Beifong's Bounty Hunters triggers, earthbending a land.
3. Resolve the Spawning Pit ability.
4. Activate Spawning Pit 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, Dragonback Assault triggers, creating a creature token.
7. Resolve the Spawning Pit ability.
8. Repeat.