Toph, the First Metalbender + Toph, Hardheaded Teacher + Goblin Bombardment + Arid Archway

Toph, the First Metalbender

Toph, Hardheaded Teacher

Goblin Bombardment

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 Goblin Bombardment 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 Goblin Bombardment ability
8. Repeat.

This intricate loop transforms a humble zero-mana artifact into a deadly engine by leveraging Toph, the First Metalbender, whose static ability turns all your nontoken artifacts into lands. With that foundation set, you cast your artifact to trigger Toph, Hardheaded Teacher, earthbending Arid Archway into a land-creature so it can be sacrificed to Goblin Bombardment. When Arid Archway dies, its earthbend clause saves it by returning it straight to the battlefield tapped, and its own entry trigger bounces the original zero-mana artifact back to your hand thanks to Toph, the First Metalbender's land-type grant. Repeating this cycle yields infinite damage, infinite sacrifice triggers, and an unbounded storm count.