Toph, the First Metalbender + Toph, Hardheaded Teacher + Guildless Commons + Coastal Hornclaw

Toph, the First Metalbender

Toph, Hardheaded Teacher

Guildless Commons

Coastal Hornclaw

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 Coastal Hornclaw 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 Coastal Hornclaw ability
8. Repeat.

This clever loop turns the battlefield into an engine by using Toph, the First Metalbender to legally transform your nontoken artifacts into lands, effectively rewriting how your permanents interact with the rules. With that crucial type-change active, Guildless Commons can be sacrificed to Coastal Hornclaw and then immediately recursion-locked back into play via Toph, Hardheaded Teacher's earthbend clause when it dies. Every time Guildless Commons re-enters, its own trigger bounces your zero-mana artifact back to your hand, fueling a continuous cycle of casting, sacrificing, and bouncing that triggers Toph, Hardheaded Teacher's earthbend ability over and over again.