Iridescent Drake, Unhallowed Pact, and Ashnod's Altar

Prerequisites

• Iridescent Drake on the battlefield
• Unhallowed Pact on the battlefield
• Ashnod's Altar on the battlefield
• Unhallowed Pact attached to Iridescent Drake

Steps

1. Activate Ashnod's Altar by sacrificing Iridescent Drake, adding
2. When Iridescent Drake dies, Unhallowed Pact triggers, returning Iridescent Drake from your graveyard to the battlefield
3. When Iridescent Drake enters the battlefield, it triggers, returning Unhallowed Pact from your graveyard to the battlefield attached to Iridescent Drake
4. Repeat

Results

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