Necroduality, Rot Hulk, and Carrion Feeder

Prerequisites

• Necroduality on the battlefield
• Rot Hulk in hand
• Carrion Feeder on the battlefield
• available

Steps

1. Cast Rot Hulk by paying
2. When Rot Hulk enters the battlefield, it and Necroduality trigger
3. Holding priority, activate Carrion Feeder by sacrificing Rot Hulk, putting a +1/+1 counter on Carrion Feeder
4. Resolve the Rot Hulk trigger, returning nothing to the battlefield
5. Resolve the Necroduality trigger, creating a token copy of Rot Hulk
6. When the Rot Hulk token enters the battlefield, it triggers, returning Rot Hulk from your graveyard to the battlefield
7. Repeat from step 2

Results

• Infinite +1/+1 counters on Carrion Feeder
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Return all Zombies from your graveyard to the battlefield