Toph, the First Metalbender + Toph, Hardheaded Teacher + Need for Speed + Arid Archway

Toph, the First Metalbender

Toph, Hardheaded Teacher

Need for Speed

Arid Archway

How it works

1. Cast the artifact by paying 0.
2. Toph, Hardheaded Teacher triggers, earthbending Arid Archway.
3. Resolve the artifact spell.
4. Activate Need for Speed by sacrificing Arid Archway.
5. When Arid Archway dies, Toph, Hardheaded Teach triggers, returning Arid Archway from your graveyard to the battlefield tapped.
6. When Arid Archway 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 Need for Speed ability
8. Repeat.

This elegant loop transforms free artifacts into a self-sustaining engine by turning them into lands via Toph, the First Metalbender, allowing Need for Speed to sacrifice them for haste. When the sacrificed land hits the graveyard, Toph, Hardheaded Teacher triggers to return it directly to the battlefield. Finally, Arid Archway's entry trigger bounces our original zero-cost artifact back to hand, ready to be cast again and keep the cycle spinning infinitely.