Screams from Within, Phyrexian Altar, and Tormod, the Desecrator

Prerequisites

• Screams from Within on the battlefield
• Phyrexian Altar on the battlefield
• Tormod, the Desecrator on the battlefield

Steps

1. Activate Phyrexian 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 creature LTB
• Infinite creature ETB
• Infinite colored mana
• Infinite creature sacrifice triggers
• Infinite death triggers