Worldheart Phoenix, Faeburrow Elder, Thornbite Staff, and Ashnod's Altar

Prerequisites

• Worldheart Phoenix on the battlefield
• Faeburrow Elder on the battlefield
• Thornbite Staff on the battlefield
• Ashnod's Altar on the battlefield
• You control a blue and a black permanent
• Thornbite Staff attached to Faeburrow Elder
• Faeburrow Elder does not have summoning sickness

Steps

1. Activate Faeburrow Elder by tapping it, adding
2. Activate Ashnod's Altar by sacrificing Worldheart Phoenix, adding
3. Worldheart Phoenix dies, triggering Faeburrow Elder, untapping Faeburrow Elder
4. Cast Worldheart Phoenix from your graveyard by paying
5. Repeat

Results

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