Teshar, Ancestor's Apostle, Yahenni, Undying Partisan, and Kor Skyfisher

Prerequisites

• Teshar, Ancestor's Apostle on the battlefield
• Yahenni, Undying Partisan on the battlefield
• Kor Skyfisher in the graveyard

Steps

1. Cast an artifact in your hand by paying
2. Teshar triggers, returning Kor Skyfisher from your graveyard to the battlefield
3. When Kor Skyfisher enters, it triggers, returning another artifact that can be cast for from the battlefield to your hand
4. Resolve the artifact spell cast in step 1
5. Activate Yahenni by sacrificing Kor Skyfisher Repeat

Results

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