Hero of the Dunes, Fiend Hunter, and Ashnod's Altar

Prerequisites

• Hero of the Dunes in exile
• Fiend Hunter on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Fiend Hunter, adding
2. When Fiend Hunter dies, its second ability triggers, returning Hero of the Dunes to the battlefield from exile
3. When Hero of the Dunes 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 Hero of the Dunes
5. Repeat

Results

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