Toph, the First Metalbender + Toph, Hardheaded Teacher + Goblin Bombardment + Simic Growth Chamber

Toph, the First Metalbender

Toph, Hardheaded Teacher

Goblin Bombardment

Simic Growth Chamber

How it works

1. Cast the artifact by paying 0.
2. Toph, Hardheaded Teacher triggers, earthbending Simic Growth Chamber.
3. Resolve the artifact spell.
4. Activate Goblin Bombardment by sacrificing Simic Growth Chamber.
5. When Simic Growth Chamber dies, Toph, Hardheaded Teach triggers, returning Simic Growth Chamber from your graveyard to the battlefield tapped.
6. When Simic Growth Chamber 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 loop relies on Toph, the First Metalbender turning your zero-mana artifacts into lands, creating a clever synergy with Simic Growth Chamber's bounce trigger. When you sacrifice that land-artifact to Goblin Bombardment, its death triggers the recursion of Toph, Hardheaded Teacher to bring it right back to the battlefield. The entering Simic Growth Chamber then triggers to bounce the original artifact back to your hand, allowing you to replay it and fuel endless loops of damage, sacrifices, and landfall triggers.