Toph, the First Metalbender + Toph, Hardheaded Teacher + Goblin Bombardment + Dimir Aqueduct

Toph, the First Metalbender

Toph, Hardheaded Teacher

Goblin Bombardment

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 Goblin Bombardment 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 Goblin Bombardment ability
8. Repeat.

This clever loop turns the static land-transforming power of Toph, the First Metalbender into an engine by treating your nontoken artifacts as lands, allowing Dimir Aqueduct to bounce them right back to your hand when it enters the battlefield. As you repeatedly cast your zero-mana artifact, Toph, Hardheaded Teacher triggers to continuously earthbend your lands into creatures, which you then feed into Goblin Bombardment. When the earthbent Dimir Aqueduct dies, Toph, Hardheaded Teacher's recursion brings it straight back to repeat the cycle, converting the bounce trigger into a recursive engine that deals infinite damage and triggers endless enters-the-battlefield and death effects.