Teshar, Ancestor's Apostle, Scrap Trawler, Welding Jar, and Yahenni, Undying Partisan

Prerequisites

• Teshar, Ancestor's Apostle on the battlefield
• Scrap Trawler in the graveyard
• Welding Jar in hand
• Yahenni, Undying Partisan on the battlefield

Steps

1. Cast Welding Jar by paying its mana cost
2. Teshar triggers, returning Scrap Trawler from your graveyard to the battlefield
3. Activate Welding Jar by sacrificing it
4. Activate Yahenni by sacrificing Scrap Trawler
5. When Scrap Trawler dies, it triggers, returning Welding Jar from your graveyard to your hand
6. Resolve the Yahenni ability
7. Repeat

Results

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