Toph, the First Metalbender + Toph, Hardheaded Teacher + Carrion Feeder + Orzhov Basilica

Toph, the First Metalbender

Toph, Hardheaded Teacher

Carrion Feeder

Orzhov Basilica

How it works

1. Cast the artifact by paying 0.
2. Toph, Hardheaded Teacher triggers, earthbending Orzhov Basilica.
3. Resolve the artifact spell.
4. Activate Carrion Feeder by sacrificing Orzhov Basilica.
5. When Orzhov Basilica dies, Toph, Hardheaded Teach triggers, returning Orzhov Basilica from your graveyard to the battlefield tapped.
6. When Orzhov Basilica 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 Carrion Feeder ability
8. Repeat.

This clever loop turns the static land-transforming power of Toph, the First Metalbender into an engine by converting a zero-mana artifact into a land that bounces itself. With Toph, Hardheaded Teacher watching your spellcasts and earthbending Orzhov Basilica into an animated land-creature, you can willingly sacrifice it to Carrion Feeder. The earthbend ability's built-in safeguard returns Orzhov Basilica to the battlefield when it dies, where its own entry trigger bounces the original zero-mana artifact back to your hand to repeat the entire cycle.