Screams from Within, Umbral Collar Zealot, and Tormod, the Desecrator

Prerequisites

• Screams from Within on the battlefield
• Umbral Collar Zealot on the battlefield
• Tormod, the Desecrator on the battlefield

Steps

1. Activate Umbral Collar Zealot by sacrificing the creature that has Screams from Within attached
2. When the creature dies, Screams from Within triggers, returning it from your graveyard to the battlefield attached to another creature you control
3. Tormod triggers, creating a creature token
4. Resolve the Umbral Collar Zealot ability
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite surveil 1