Goblin Welder, Dross Scorpion, and Encroaching Mycosynth

Prerequisites

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

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