Prowling Geistcatcher, Karmic Guide, and Carrion Feeder

Prerequisites

• Prowling Geistcatcher on the battlefield
• Karmic Guide on the battlefield
• Carrion Feeder on the battlefield

Steps

1. Activate Carrion Feeder by sacrificing Karmic Guide
2. When Karmic Guide dies, Prowling Geistcatcher's first ability triggers, exiling Karmic Guide from your graveyard
3. Activate Carrion Feeder by sacrificing Prowling Geistcatcher
4. When Prowling Geistcatcher dies, its second ability triggers, returning Karmic Guide from exile to the battlefield
5. When Karmic Guide enters the battlefield, it triggers, returning Prowling Geistcatcher from your graveyard to the battlefield
6. Resolve the Carrion Feeder abilities from step 1 and step 3, putting two +1/+1 counters on it
7. Repeat

Results

• Infinite +1/+1 counters on Carrion Feeder
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers