Goblin Welder + Thornbite Staff + Perilous Myr

Goblin Welder
Thornbite Staff
Perilous Myr

Requires
Goblin Welder must be on the battlefield. Thornbite Staff must be on the battlefield. Perilous Myr must be 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.

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