Teshar, Ancestor's Apostle, Aether Channeler, Mana Vault, and Altar of Dementia

Prerequisites

• Teshar, Ancestor's Apostle on the battlefield
• Aether Channeler on the battlefield
• Mana Vault on the battlefield
• Altar of Dementia on the battlefield

Steps

1. Activate Altar of Dementia by sacrificing Aether Channeler, causing target player to mill cards equal to Aether Channeler's power
2. Activate Mana Vault 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 Vault from the battlefield to your hand
6. Activate Altar of Dementia by sacrificing Aether Channeler, causing target player to mill cards equal to Aether Channeler's power
7. Cast Mana Vault 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 mill
• Infinite sacrifice triggers
• Infinite self-mill
• Infinite storm count