Toph, the First Metalbender + Toph, Hardheaded Teacher + Ashnod's Altar + Dimir Aqueduct

Toph, the First Metalbender

Toph, Hardheaded Teacher

Ashnod's Altar

Dimir Aqueduct

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 Ashnod's Altar 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. Repeat.

This clever loop transforms a zero-mana artifact into an infinite engine by leveraging Toph, the First Metalbender's static ability to turn nontoken artifacts into lands. With that foundation set, casting the artifact triggers Toph, Hardheaded Teacher to earthbend your Dimir Aqueduct into a land-creature, making it prime fodder for Ashnod's Altar to generate colorless mana while sending it to the graveyard. Because Toph, the First Metalbender's earthbend effect triggers when the land-creature dies or is exiled, Dimir Aqueduct safely returns to the battlefield tapped, where its own bounce trigger forces the zero-mana artifact right back to your hand to restart the entire cycle.