Luminous Broodmoth, Felidar Guardian, Gravity Sphere, and Ashnod's Altar

Prerequisites

• Luminous Broodmoth on the battlefield
• Felidar Guardian on the battlefield
• Gravity Sphere on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Sacrifice Felidar Guardian to Ashnod's Altar to add
2. Luminous Broodmoth triggers, returning Felidar Guardian to the battlefield with a flying counter on it
3. Felidar Guardian's ETB triggers, exiling Mystic Decree and then returning it to the battlefield
4. Repeat

Results

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