Ashnod's Altar, Fiend Hunter, and Rescue Skiff

Prerequisites

• Ashnod's Altar on the battlefield
• Fiend Hunter in hand
• Rescue Skiff on the battlefield
• available

Steps

1. Cast Fiend Hunter by paying its mana cost
2. When Fiend Hunter enters, its first ability triggers, exiling Rescue Skiff
3. Activate Ashnod's Altar by sacrificing Fiend Hunter
4. When Fiend Hunter dies, its second ability triggers, returning Rescue Skiff from exile to the battlefield
5. When Rescue Skiff enters, it triggers, returning Fiend Hunter from your graveyard to the battlefield
6. When Fiend Hunter enters, its first ability triggers, exiling Rescue Skiff
7. Repeat from step 3

Results

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