Toph, the First Metalbender + Haru, Hidden Talent + Universal Automaton + Yahenni, Undying Partisan

Toph, the First Metalbender

Haru, Hidden Talent

Universal Automaton

Yahenni, Undying Partisan

How it works

1. Cast Universal Automaton by paying 1.
2. When Universal Automaton enters, Haru triggers, targeting Universal Automaton as it is a land due to Toph.
3. Activate Yahenni by sacrificing Universal Automaton.
4. When Universal Automaton dies, Haru triggers, returning Universal Automaton from your graveyard to the battlefield tapped.
5. When Universal Automaton enters, Haru triggers, targeting Universal Automaton as it is a land due to Toph.
6. Resolve the Yahenni ability.
7. Repeat from step 3.

This elegant loop turns your entire artifact suite into a self-sustaining engine, anchored by Toph, the First Metalbender transforming your nontoken artifacts into lands. Because Universal Automaton possesses every creature type thanks to changeling, it counts as an Ally to trigger Haru, Hidden Talent whenever it arrives, allowing you to continually target the Automaton itself with earthbend. You then feed Universal Automaton to Yahenni, Undying Partisan's sacrifice ability, triggering Haru's return effect to loop the Automaton right back onto the battlefield.