Archon of Falling Stars, Necromancy, and Ashnod's Altar

Prerequisites

• Archon of Falling Stars on the battlefield
• Necromancy in the graveyard
• Ashnod's Altar on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Archon of Falling Stars, adding
2. When Archon of Falling Stars dies, it triggers, returning Necromancy from your graveyard to the battlefield
3. When Necromancy enters the battlefield, it triggers, returning Archon of Falling Stars from your graveyard to the battlefield, and attaching Necromancy to it
4. Repeat

Results

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