Carnival of Souls, Gravecrawler, Carrion Feeder, and Zulaport Cutthroat

Prerequisites

• Carnival of Souls on the battlefield
• Gravecrawler on the battlefield
• Carrion Feeder on the battlefield
• Zulaport Cutthroat on the battlefield
• available

Steps

1. Activate Carrion Feeder by sacrificing Gravecrawler
2. Zulaport Cutthroat triggers, causing each opponent to lose 1 life and gaining you 1 life
3. Resolve the Carrion Feeder's ability, putting a +1/+1counter on it
4. Cast Gravecrawler from your graveyard to the battlefield by paying
5. Carnival of Souls triggers, causing you to lose 1 life and adding
6. Repeat

Results

• Infinite ETB
• Infinite lifegain triggers
• Infinite lifeloss
• Infinite LTB