Toph, the First Metalbender + Toph, Hardheaded Teacher + Selesnya Sanctuary + Yahenni, Undying Partisan

Toph, the First Metalbender

Toph, Hardheaded Teacher

Selesnya Sanctuary

Yahenni, Undying Partisan

How it works

1. Cast the artifact by paying 0.
2. Toph, Hardheaded Teacher triggers, earthbending Selesnya Sanctuary.
3. Resolve the artifact spell.
4. Activate Yahenni by sacrificing Selesnya Sanctuary.
5. When Selesnya Sanctuary dies, Toph, Hardheaded Teach triggers, returning Selesnya Sanctuary from your graveyard to the battlefield tapped.
6. When Selesnya Sanctuary 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 clever loop transforms a humble zero-mana artifact into a perpetual motion machine by turning it into a land through Toph, the First Metalbender's static ability, allowing it to masquerade as a permanent that can constantly bounce itself back to your hand. Whenever you cast that artifact, Toph, Hardheaded Teacher triggers to earthbend Selesnya Sanctuary into a creature, making it vulnerable to being sacrificed to Yahenni, Undying Partisan's activation. Because Selesnya Sanctuary's own entrance trigger forces you to return a land to your hand—and Toph, the First Metalbender makes your zero-mana artifact count as one—the Sanctuary neatly scoops the artifact right back to your hand as it enters the battlefield tapped. Meanwhile, Yahenni, Undying Partisan happily grows with a stream of endless counters while fueling the sacrifice outlet needed to keep the cycle spinning.