Goblin Welder, Thornbite Staff, and Perilous Myr

Prerequisites

• Goblin Welder on the battlefield
• Thornbite Staff on the battlefield
• Perilous Myr in the graveyard
• Thornbite Staff attached to Goblin Welder
• You control a nontoken artifact creature
• Goblin Welder does not have summoning sickness

Steps

1. Tap Goblin Welder, targeting the artifact creature on the battlefield and Perilous Myr in your graveyard
2. The artifact creature is sacrificed and Perilous Myr enters the battlefield
3. Goblin Welder triggers, untapping itself
4. Activate Goblin Welder again, targeting the artifact creature in your graveyard and Perilous Myr on the battlefield
5. The artifact creature returns to the battlefield and Perilous Myr is sacrificed
6. Goblin Welder triggers, untapping itself
7. Perilous Myr triggers, dealing 2 damage to any target
8. Repeat for infinite damage

Results

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