Toph, the First Metalbender + Toph, Hardheaded Teacher + Zuran Orb + Guildless Commons

Toph, the First Metalbender

Toph, Hardheaded Teacher

Zuran Orb

Guildless Commons

How it works

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

This clever loop turns the self-bouncing nature of Guildless Commons into an infinite engine by leveraging Toph, the First Metalbender, whose static ability cleverly classifies your 0-mana artifacts as lands. With that foundation set, you cast your artifact for free, letting Toph, Hardheaded Teacher earthbend the Guildless Commons into a creature so it can be willingly sacrificed to Zuran Orb for a steady stream of life. When the Commons hits the graveyard, Toph, Hardheaded Teacher steps in again with her triggered ability to bring it right back to the battlefield, where its own entry trigger forces it to bounce your freshly cast artifact back to your hand to start the cycle all over again.