Toph, the First Metalbender + Toph, Hardheaded Teacher + Altar of Dementia + Selesnya Sanctuary

Toph, the First Metalbender

Toph, Hardheaded Teacher

Altar of Dementia

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 Altar of Dementia 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 Altar of Dementia ability
8. Repeat.

This ingenious loop turns a zero-cost artifact into an engine of endless mill by treating your artifacts as lands. With Toph, the First Metalbender actively redefining all your nontoken artifacts as lands, playing that free artifact triggers Toph, Hardheaded Teacher to earthbend your Selesnya Sanctuary into a creature. You then feed that animated land to Altar of Dementia, triggering Toph, Hardheaded Teacher's safety net to bring the Sanctuary right back to the battlefield tapped. When Selesnya Sanctuary enters, its own bounce ability forces it to pick up your zero-mana artifact, letting you replay the whole cycle infinitely.