Dross Scorpion + Encroaching Mycosynth + Goblin Welder

UR identity

Commander legal

The 3 combo pieces

• Dross Scorpion
• Encroaching Mycosynth
• Goblin Welder

What must be in place

Goblin Welder does not have summoning sickness.
You control at least one other nontoken artifact creature.
You have at least one artifact creature card in your graveyard.

How to execute it

1. Activate Goblin Welder by tapping it, sacrificing any artifact creature you control and returning any other artifact creature from your graveyard to the battlefield.
2. The sacrificed creature dies, triggering Dross Scorpion, untapping Goblin Welder.
3. Repeat.

What the combo produces

• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite sacrifice triggers