Beifong's Bounty Hunters + Phyrexian Altar + Sporemound

Beifong's Bounty Hunters

Phyrexian Altar

Sporemound

How it works

1. Activate Phyrexian Altar by sacrificing another nonland creature you control.
2. When the creature dies, Beifong's Bounty Hunters triggers, earthbending a land.
3. Activate Phyrexian Altar by sacrificing the land.
4. When the land dies, Beifong's Bounty Hunters triggers, returning the land from your graveyard to the battlefield tapped.
5. When the land enters, Sporemound triggers, creating a creature token.
6. Repeat.