Toph, the First Metalbender + Toph, Hardheaded Teacher + Umbral Collar Zealot + Simic Growth Chamber

Toph, the First Metalbender

Toph, Hardheaded Teacher

Umbral Collar Zealot

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 Umbral Collar Zealot 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 Umbral Collar Zealot ability
8. Repeat.

This clever loop transforms a free artifact into an infinite engine by leveraging Toph, the First Metalbender, whose static ability turns all your nontoken artifacts into lands. When you cast your zero-mana artifact, Toph, Hardheaded Teacher triggers to earthbend your Simic Growth Chamber into a creature, allowing Umbral Collar Zealot to sacrifice it. The resulting death trigger causes Toph, Hardheaded Teacher's earthbend clause to return the bouncing land straight back to the battlefield tapped, where Simic Growth Chamber's own enters-the-battlefield trigger then picks up your original artifact. By looping this sequence endlessly, you cycle the artifact back to your hand while triggering continuous landfall, artifact movement, and the surveil ability from Umbral Collar Zealot.