Toph, the First Metalbender + Toph, Hardheaded Teacher + Goblin Bombardment + Selesnya Sanctuary

Toph, the First Metalbender

Toph, Hardheaded Teacher

Goblin Bombardment

Selesnya Sanctuary

How it works

1. Cast the artifact by paying 0.
2. Toph, Hardheaded Teacher triggers, earthbending Selesnya Sanctuary.
3. Resolve the artifact spell.
4. Activate Goblin Bombardment by sacrificing Selesnya Sanctuary.
5. When Selesnya Sanctuary dies, Toph, Hardheaded Teach triggers, returning Selesnya Sanctuary from your graveyard to the battlefield tapped.
6. When Selesnya Sanctuary 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 transforms a free 0-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 the artifact to trigger Toph, Hardheaded Teacher, earthbending Selesnya Sanctuary into a land-creature so it can be sacrificed to Goblin Bombardment. Because Selesnya Sanctuary's own enter-the-battlefield trigger forces you to bounce a land, it cleverly targets the very same artifact you just cast, returning it to your hand to start the cycle anew. Every iteration deals infinite damage and racks up infinite sacrifice and landfall triggers as Selesnya Sanctuary continually dies and bounces right back to your hand.