Toph, the First Metalbender + Toph, Hardheaded Teacher + Orzhov Basilica + Phantom Train

Toph, the First Metalbender

Toph, Hardheaded Teacher

Orzhov Basilica

Phantom Train

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 Phantom Train 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 Phantom Train ability
8. Repeat.

This clever loop transforms a humble zero-mana artifact into a perpetual motion machine by turning it into a land with Toph, the First Metalbender. Once that artifact enters, Toph, Hardheaded Teacher triggers to earthbend Orzhov Basilica, which promptly gets sacrificed to Phantom Train's ability to pump the Vehicle. Because Orzhov Basilica dies as a land, its demise triggers its own return thanks to Toph's earthbend clause, and its subsequent entry triggers its bounce ability to scoop up the original artifact—fueling an endless cycle of sacrifice, landfall, and triggers.