Teshar, Ancestor's Apostle, Aether Channeler, Mana Crypt, and Yahenni, Undying Partisan

Prerequisites

• Teshar, Ancestor's Apostle on the battlefield
• Aether Channeler on the battlefield
• Mana Crypt on the battlefield
• Yahenni, Undying Partisan on the battlefield

Steps

1. Activate Yahenni by sacrificing Aether Channeler, giving Yahenni indestructible until end of turn
2. Activate Mana Crypt by tapping it, adding
3. Cast the other artifact with MV<=2 by paying at most
4. Teshar triggers, returning Aether Channeler from your graveyard to the battlefield
5. When Aether Channeler enters the battlefield, it triggers, returning Mana Crypt from the battlefield to your hand
6. Activate Yahenni by sacrificing Aether Channeler, giving Yahenni indestructible until end of turn
7. Cast Mana Crypt by paying
8. Teshar triggers, returning Aether Channeler from your graveyard to the battlefield
9. When Aether Channeler enters the battlefield, it triggers, returning the other artifact from the battlefield to your hand
10. Repeat

Results

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