Adarkar Valkyrie, Village Bell-Ringer, and Viscera Seer

Prerequisites

• Adarkar Valkyrie on the battlefield
• Village Bell-Ringer on the battlefield
• Viscera Seer on the battlefield
• Adarkar Valkyrie does not have summoning sickness

Steps

1. Activate Adarkar Valkyrie by tapping it, making it so the next time Village Bell-Ringer dies this turn it will be returned to the battlefield
2. Activate Viscera Seer by sacrificing Village Bell-Ringer
3. Adarkar Valkyrie triggers, returning Village Bell-Ringer to the battlefield
4. Village Bell-Ringer enters the battlefield, untapping all creatures you control
5. Resolve the Viscera Seer's ability, scrying one
6. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite scry 1
• Infinite untap of creatures you control
• Infinite mana creatures you control can produce