Toph, the First Metalbender + Haru, Hidden Talent + Stonework Puma + Ashnod's Altar

Toph, the First Metalbender

Haru, Hidden Talent

Stonework Puma

Ashnod's Altar

How it works

1. Cast Stonework Puma by paying 3.
2. When Stonework Puma enters, Haru triggers, targeting Stonework Puma as it is a land due to Toph.
3. Activate Ashnod's Altar by sacrificing Stonework Puma.
4. When Stonework Puma dies, Haru triggers, returning Stonework Puma from your graveyard to the battlefield tapped.
5. When Stonework Puma enters, Haru triggers, targeting Stonework Puma as it is a land due to Toph.
6. Repeat from step 3.

This clever loop turns your nontoken artifacts into lands thanks to Toph, the First Metalbender, allowing Stonework Puma to count as a land for its own targeting requirements. When Stonework Puma enters the battlefield, Haru, Hidden Talent triggers to earthbend it into a creature-land, and Ashnod's Altar then lets you sacrifice that newly minted creature for two colorless mana. Because earthbending ensures that when Stonework Puma dies or is exiled it returns to the battlefield tapped, it instantly triggers Haru, Hidden Talent all over again to restart the cycle.