Baloth Prime + Beifong's Bounty Hunters + Phyrexian Altar

Baloth Prime

Beifong's Bounty Hunters

Phyrexian Altar

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 you control.
3. Activate Phyrexian Altar by sacrificing the earthbent land.
4. When the land dies, it and Baloth Prime trigger.
5. Resolve the land's trigger, returning it from your graveyard to the battlefield tapped.
6. Resolve the Baloth Prime trigger, untapping it and creating a tapped 4/4 Beast creature token.
7. Repeat.