Narcomoeba, Mortuary, Selhoff Occultist, and Yahenni, Undying Partisan

Prerequisites

• Narcomoeba on the battlefield
• Mortuary on the battlefield
• Selhoff Occultist on the battlefield
• Yahenni, Undying Partisan on the battlefield

Steps

1. Activate Yahenni by sacrificing Narcomoeba
2. When Narcomoeba dies, Selhoff Occultist and Mortuary trigger
3. Resolve the Mortuary trigger, putting Narcomoeba from your graveyard on top of your library
4. Resolve the Selhoff Occultist trigger, causing you to mill Narcomoeba from the top of your library
5. Narcomoeba triggers, putting it from your graveyard onto the battlefield
6. Resolve the Yahenni, Undying Partisan ability from step 1, giving it indestructible until end of turn
7. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers