Screams from Within, Ashnod's Altar, and Quintorius, Field Historian

Prerequisites

• Screams from Within on the battlefield
• Ashnod's Altar on the battlefield
• Quintorius, Field Historian 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. Quintorius triggers, creating a creature token
4. Repeat

Results

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