Toph, the First Metalbender + Haru, Hidden Talent + Stonework Puma + Yahenni, Undying Partisan

Toph, the First Metalbender

Haru, Hidden Talent

Stonework Puma

Yahenni, Undying Partisan

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 Yahenni 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 Yahenni ability.
7. Repeat from step 3.

This clever loop turns your nontoken artifacts into lands thanks to Toph, the First Metalbender, allowing Stonework Puma to double as a land for the earthbend mechanic. When Stonework Puma enters the battlefield, Haru, Hidden Talent triggers to earthbend it into a creature-land, letting Yahenni, Undying Partisan sacrifice it to feed its growing power. Because earthbending returns the card to the battlefield tapped when it dies, Stonework Puma immediately triggers Haru, Hidden Talent all over again to sustain an infinite loop of sacrifices and death triggers.