Necroduality, Rot Hulk, and Umbral Collar Zealot

Prerequisites

• Necroduality on the battlefield
• Rot Hulk in hand
• Umbral Collar Zealot on the battlefield
• available

Steps

1. Cast Rot Hulk by paying
2. When Rot Hulk enters, it and Necroduality trigger
3. Holding priority, activate Umbral Collar Zealot by sacrificing Rot Hulk
4. Resolve the Rot Hulk trigger, failing to return anything to the battlefield
5. Resolve the Necroduality trigger, creating a token copy of Rot Hulk
6. When the token Rot Hulk enters, it triggers, returning Rot Hulk from your graveyard to the battlefield
7. Repeat from step 2

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature tokens
• Infinite death triggers
• Infinite creature sacrifice triggers
• Infinite surveil
• Return some creature cards from your graveyard to the battlefield