Adarkar Valkyrie, Sparring Mummy, and Viscera Seer

Prerequisites

• Adarkar Valkyrie on the battlefield
• Sparring Mummy 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 Sparring Mummy dies this turn it will be returned to the battlefield
2. Activate Viscera Seer by sacrificing Sparring Mummy
3. Adarkar Valkyrie triggers, returning Sparring Mummy to the battlefield
4. Sparring Mummy enters the battlefield, untapping Adarkar Valkyrie
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