Toph, the First Metalbender + Toph, Hardheaded Teacher + Ashnod's Altar + Guildless Commons

Toph, the First Metalbender

Toph, Hardheaded Teacher

Ashnod's Altar

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 Ashnod's Altar 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. Repeat.

This intricate loop relies entirely on Toph, the First Metalbender redefining your nontoken artifacts as lands, which allows Guildless Commons to treat them as valid targets for its bounce ability when it enters the battlefield. You use this interaction to repeatedly loop a zero-mana artifact, constantly triggering Toph, Hardheaded Teacher's earthbend ability to turn Guildless Commons into a creature before sacrificing it to Ashnod's Altar for colorless mana. Because Guildless Commons returns itself to the battlefield tapped whenever it dies—thanks to the safety net provided by Toph's earthbend trigger—you can endlessly bounce your free artifact, fuel your mana pool, and generate infinite triggers of every stripe.