Color Identity: R

Prerequisites

  1.  All permanents on the battlefield.
  2. Goblin Welder
    Goblin Welder
    does not have summoning sickness.
  3. You control at least one other nontoken artifact creature.
  4. You have at least one artifact creature card in your graveyard.

Steps

  1. Activate
    Goblin Welder
    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
    Dross Scorpion
    , untapping
    Goblin Welder
    Goblin Welder
    .
  3. Repeat.

Results

  1. Infinite death triggers.
  2. Infinite ETB.
  3. Infinite LTB.
  4. Infinite sacrifice triggers.

Metadata

  1. In 423 decks according to EDHREC.
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