Toph, the First Metalbender + Toph, Hardheaded Teacher + Umbral Collar Zealot + Azorius Chancery

Toph, the First Metalbender

Toph, Hardheaded Teacher

Umbral Collar Zealot

Azorius Chancery

How it works

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

This intricate engine relies on Toph, the First Metalbender turning your zero-mana artifacts into lands, transforming them into prime targets for Azorius Chancery's bounce ability. By utilizing Toph, Hardheaded Teacher to animate your lands and fuel your spells, you can sacrifice your newly land-ified artifact to Umbral Collar Zealot for repeated surveil triggers. When that land hits the graveyard, Toph, Hardheaded Teacher's safety net returns it directly to the battlefield, setting off Azorius Chancery's entry trigger to bounce the artifact back to your hand and starting the loop all over again.