Toph, the First Metalbender + Toph, Hardheaded Teacher + Simic Growth Chamber + Yahenni, Undying Partisan

Toph, the First Metalbender

Toph, Hardheaded Teacher

Simic Growth Chamber

Yahenni, Undying Partisan

How it works

1. Cast the artifact by paying 0.
2. Toph, Hardheaded Teacher triggers, earthbending Simic Growth Chamber.
3. Resolve the artifact spell.
4. Activate Yahenni by sacrificing Simic Growth Chamber.
5. When Simic Growth Chamber dies, Toph, Hardheaded Teach triggers, returning Simic Growth Chamber from your graveyard to the battlefield tapped.
6. When Simic Growth Chamber enters, it triggers, returning the artifact cast in step 1 from the battlefield to your hand, as it's a land due to Toph, the First Metalbender.
7. Resolve the Yahenni ability
8. Repeat.

This ingenious loop turns a zero-cost artifact into an engine of endless rebirth by leveraging Toph, the First Metalbender to fundamentally rewrite the battlefield, turning your nontoken artifacts into lands. With that foundation laid, Toph, Hardheaded Teacher triggers off your spellcasting to animate Simic Growth Chamber into a creature that you can readily feed to Yahenni, Undying Partisan. As Yahenni grants itself indestructible by sacrificing the animated bounceland, the ensuing death trigger—combined with Simic Growth Chamber's own land-entry ability—brings the land right back while bouncing your original artifact back to hand to restart the entire sequence.