Goblin Welder + Esper Sojourners + Dross Scorpion + Liquimetal Torque

Goblin Welder

Esper Sojourners

Dross Scorpion

Liquimetal Torque

How it works

1. Activate Liquimetal Torque's second ability by tapping it, causing Goblin Welder to become an artifact in addition to its other types until end of turn.
2. Activate Goblin Welder by tapping it, sacrificing Dross Scorpion and returning Esper Sojourners from your graveyard to the battlefield.
3. Dross Scorpion triggers, untapping Goblin Welder.
4. Activate Goblin Welder by tapping it, sacrificing Esper Sojourners and returning Dross Scorpion from your graveyard to the battlefield.
5. Esper Sojourners triggers, untapping Goblin Welder.
6. Repeat from step 2.

This clever loop turns the graveyard into a bustling workshop by transforming Goblin Welder into an artifact with Liquimetal Torque, allowing the Welder to swap itself back and forth with Dross Scorpion. Every time an artifact creature dies, Dross Scorpion triggers to untap your makeshift artifact-Welder, while Esper Sojourners steps in to do the exact same untapping work whenever it hits the graveyard or is cycled. By continuously recycling Dross Scorpion and Esper Sojourners through the graveyard, you generate an endless cascade of enters-the-battlefield, leaves-the-battlefield, and death triggers.