Toph, the First Metalbender + Toph, Hardheaded Teacher + Thaumatog + Boros Garrison

Toph, the First Metalbender

Toph, Hardheaded Teacher

Thaumatog

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 Thaumatog 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 Thaumatog ability
8. Repeat.

This clever loop turns cheap artifacts into a self-sustaining engine by letting Toph, the First Metalbender redefine your non-token artifacts as lands. Once that foundation is set, you can cast your artifact for zero mana to trigger Toph, Hardheaded Teacher, earthbending Boros Garrison into a land-creature so it's ready to be sacrificed to Thaumatog. As Boros Garrison hits the graveyard, its death triggers the return effect from Toph, Hardheaded Teacher, while its subsequent re-entry triggers its own bounce ability to return the original zero-mana artifact back to your hand. Boros Garrison's ability to return a land to your hand is what naturally fuels this loop, since Toph, the First Metalbender ensures your castable artifact counts as a valid land target for that bounce. Thaumatog acts as the sacrifice outlet that keeps the cycle moving while growing infinitely large, turning a humble pile of permanent types into an endless storm of triggers.