Toph, the First Metalbender + Toph, Hardheaded Teacher + Zuran Orb + Orzhov Basilica

Toph, the First Metalbender

Toph, Hardheaded Teacher

Zuran Orb

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 Zuran Orb 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 Zuran Orb ability
8. Repeat.

This intricate loop transforms a humble zero-cost artifact into a self-sustaining engine by completely redefining its card type: thanks to Toph, the First Metalbender, that artifact is treated as a land while on the battlefield. You then cast it, triggering Toph, Hardheaded Teacher to earthbend Orzhov Basilica into a living land creature. Zuran Orb steps in to immediately sacrifice that animated land for a steady stream of life, sending Orzhov Basilica to the graveyard. Because of its earthbent nature, its death triggers its return to the battlefield, which in turn forces Orzhov Basilica's own entry ability to bounce your zero-cost artifact back to your hand so you can cast it all over again.