Toph, the First Metalbender + Toph, Hardheaded Teacher + Lithatog + Simic Growth Chamber

Toph, the First Metalbender

Toph, Hardheaded Teacher

Lithatog

Simic Growth Chamber

How it works

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

This ingenious loop transforms ordinary artifact bouncing into an endless engine by leveraging the passive land-types granted by Toph, the First Metalbender. Because Toph turns your nontoken artifacts into lands, when you cast a zero-mana artifact, Simic Growth Chamber's entry trigger can bounce that very artifact right back to your hand. Meanwhile, Lithatog acts as your sacrifice outlet, sending Simic Growth Chamber to the graveyard so that Toph, Hardheaded Teacher can instantly use its resurrection and earthbending abilities to loop the entire process.