Feasting Troll King, Witch's Oven, Clock of Omens, and Primal Vigor

Prerequisites

• Feasting Troll King on the battlefield
• Witch's Oven on the battlefield
• Clock of Omens on the battlefield
• Primal Vigor on the battlefield

Steps

1. Activate Witch's Oven by tapping it and sacrificing Feasting Troll King, creating four Food artifact tokens
2. Activate Clock of Omens by tapping two Foods, untapping Witch's Oven
3. Activate Feasting Troll King by sacrificing three Foods, causing you to return it from your graveyard to the battlefield
4. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite Food tokens
• Infinite LTB
• Infinite mana artifacts you control can produce
• Infinite sacrifice triggers
• Infinite untap of artifacts you control