Fiend Hunter, Karmic Guide, and Phyrexian Altar

Prerequisites

• Fiend Hunter in hand
• Karmic Guide on the battlefield
• Phyrexian Altar on the battlefield
• available

Steps

1. Cast Fiend Hunter by paying
2. Fiend Hunter enters the battlefield, exiling Karmic Guide
3. Activate Phyrexian Altar by sacrificing Fiend Hunter, adding one mana of any color
4. Fiend Hunter leaves the battlefield, returning Karmic Guide from exile to the battlefield
5. Karmic Guide enters the battlefield, returning Fiend Hunter from your graveyard to the battlefield
6. Repeat from step 2

Results

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