Teshar, Ancestor's Apostle, Aether Channeler, Mana Vault, and Bartolomé del Presidio

Prerequisites

• Teshar, Ancestor's Apostle on the battlefield
• Aether Channeler on the battlefield
• Mana Vault on the battlefield
• Bartolomé del Presidio on the battlefield

Steps

1. Activate Bartolomé del Presidio by sacrificing Aether Channeler, putting a +1/+1 counter on it
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 Bartolomé del Presidio by sacrificing Aether Channeler, putting a +1/+1 counter on it
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 +1/+1 counters on Bartolomé del Presidio
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count