Crypt Champion, Fiend Hunter, and Phyrexian Altar

Prerequisites

• Crypt Champion on the battlefield
• Fiend Hunter in hand
• Phyrexian Altar on the battlefield
• available

Steps

1. Cast Fiend Hunter by paying
2. Fiend Hunter enters the battlefield, exiling Crypt Champion
3. Activate Phyrexian Altar by sacrificing Fiend Hunter, adding one mana of any color
4. Fiend Hunter leaves the battlefield, returning Crypt Champion from exile to the battlefield
5. Crypt Champion enters the battlefield, triggering its first and second abilities
6. Resolve the first Crypt Champion trigger, returning Fiend Hunter from your graveyard to the battlefield
7. Repeat from step 2

Results

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