Toph, the First Metalbender + Haru, Hidden Talent + Stonework Puma + Coastal Hornclaw

Toph, the First Metalbender

Haru, Hidden Talent

Stonework Puma

Coastal Hornclaw

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 Coastal Hornclaw 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. Resolve the Coastal Hornclaw ability.
7. Repeat from step 3.

This ingenious loop relies on Toph, the First Metalbender's static ability to transform all your nontoken artifacts into lands, effectively turning the artifact creature Stonework Puma into a legal land target for earthbending. Once Stonework Puma is on the field, Haru, Hidden Talent triggers upon its entry to earthbend it, while Coastal Hornclaw provides the sacrifice outlet needed to put it into the graveyard. The crucial kicker is the earthbend mechanic's built-in safety net: when your newly-minted land creature dies, it returns to the battlefield tapped, instantly triggering Haru, Hidden Talent all over again to sustain an endless cycle of sacrifices and returns.