Toph, the First Metalbender + Toph, Hardheaded Teacher + Viscera Seer + Boros Garrison

Toph, the First Metalbender

Toph, Hardheaded Teacher

Viscera Seer

Boros Garrison

How it works

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

This ingenious loop turns your free artifact into an infinite engine by leveraging Toph, the First Metalbender, whose static ability reclassifies all your nontoken artifacts as lands. With that foundation set, casting your free artifact triggers Toph, Hardheaded Teacher to animate Boros Garrison into an earthbent creature land, which you can immediately sacrifice to Viscera Seer. Because Boros Garrison is a land, its death triggers Toph, Hardheaded Teacher's safety net to return it straight to the battlefield tapped, prompting its own entry trigger to bounce the original artifact back to your hand for another zero-mana cast.