Goblin Welder, Scrap Trawler, Mirran Spy, and Lantern of Insight

Prerequisites

• Goblin Welder on the battlefield
• Scrap Trawler on the battlefield
• Mirran Spy on the battlefield
• Lantern of Insight in the graveyard

Steps

1. Activate Goblin Welder by tapping it, causing you to sacrifice the artifact with mana value 0 and return Lantern of Insight from your graveyard to the battlefield
2. Scrap Trawler triggers, returning nothing to your hand
3. Activate Lantern of Insight by tapping and sacrificing it
4. Scrap Trawler triggers, returning the artifact with mana value 0 from your graveyard to your hand
5. Resolve the Lantern of Insight ability
6. Cast the artifact with mana value 0 by paying
7. Mirran Spy triggers, untapping Goblin Welder
8. Repeat

Results

• Infinite artifact ETB
• Infinite artifact LTB
• Infinite artifact sacrifice triggers
• Infinite storm count