Karmic Guide, Fiend Hunter, and Thermopod

Prerequisites

• Karmic Guide in exile
• Fiend Hunter on the battlefield
• Thermopod on the battlefield

Steps

1. Activate Thermopod's second ability by sacrificing Fiend Hunter, adding
2. When Fiend Hunter dies, its second ability triggers, returning Karmic Guide to the battlefield from exile
3. When Karmic Guide enters the battlefield, it triggers, returning Fiend Hunter from your graveyard to the battlefield
4. When Fiend Hunter enters the battlefield, its first ability triggers, exiling Karmic Guide
5. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite red mana
• Infinite sacrifice triggers