Goblin Welder, Dross Scorpion, and Encroaching Mycosynth

Prerequisites

• Goblin Welder on the battlefield
• Dross Scorpion on the battlefield
• Encroaching Mycosynth on the battlefield

Steps

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

Results

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