Screams from Within, Ashnod's Altar, and Tormod, the Desecrator

Prerequisites

• Screams from Within on the battlefield
• Ashnod's Altar on the battlefield
• Tormod, the Desecrator on the battlefield

Steps

1. Activate Ashnod's Altar 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. Repeat

Results

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