Toph, the First Metalbender + Toph, Hardheaded Teacher + Dimir Aqueduct + Trenching Steed

Toph, the First Metalbender

Toph, Hardheaded Teacher

Dimir Aqueduct

Trenching Steed

How it works

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

This clever engine turns your graveyard into a revolving door by leveraging Toph, the First Metalbender to permanently turn your 0-cost artifacts into lands. Once they share land status, Trenching Steed lets you sacrifice Dimir Aqueduct to fuel its toughness boost, which immediately triggers Toph, Hardheaded Teacher to rescue the Aqueduct right back from the graveyard. Finally, when Dimir Aqueduct re-enters the battlefield, its bounce trigger targets the artifact land you originally cast, returning it to your hand so you can recast it and start the loop all over again.