Toph, the First Metalbender + Toph, Hardheaded Teacher + Selesnya Sanctuary + Phantom Train

Toph, the First Metalbender

Toph, Hardheaded Teacher

Selesnya Sanctuary

Phantom Train

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 Phantom Train 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 Phantom Train ability
8. Repeat.

This clever loop turns the static land-transforming power of Toph, the First Metalbender into an infinite engine by relying on the bounce trigger of Selesnya Sanctuary. Because Toph, the First Metalbender makes all your nontoken artifacts into lands, casting a free artifact lets you feed it directly to Phantom Train's sacrifice ability. When Selesnya Sanctuary hits the graveyard, Toph, Hardheaded Teacher brings it right back to the battlefield—which in turn triggers the Sanctuary's own entry ability to pick up your original artifact so you can cast it all over again.