Teshar, Ancestor's Apostle, Scrap Trawler, Lotus Petal, and Yahenni, Undying Partisan

Prerequisites

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

Steps

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

Results

• Infinite LTB
• Infinite ETB
• Infinite colored mana
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite storm count