Gravespawn Sovereign, Village Bell-Ringer, and Carrion Feeder

Prerequisites

• Gravespawn Sovereign on the battlefield
• Village Bell-Ringer on the battlefield
• Carrion Feeder on the battlefield
• You control at least three other Zombies

Steps

1. Activate Carrion Feeder by sacrificing Village Bell-Ringer, putting a +1/+1 counter on Carrion Feeder
2. Activate Gravespawn Sovereign by tapping five untapped Zombies you control, returning Village Bell-Ringer from your graveyard to the battlefield
3. Village Bell-Ringer enters the battlefield, untapping all creatures you control
4. Repeat

Results

• Infinite +1/+1 counters on Carrion Feeder
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mana creatures you control can produce
• Infinite sacrifice triggers
• Infinite untap of creatures you control