Tortured Existence, Phyrexian Altar, and Quintorius, Field Historian

Prerequisites

• Tortured Existence on the battlefield
• Phyrexian Altar on the battlefield
• Quintorius, Field Historian on the battlefield
• undefined available

Steps

1. Activate Tortured Existence by paying and discarding a creature card, returning another creature card from your graveyard to your hand
2. Quintorius triggers, creating a creature token
3. Activate Phyrexian Altar by sacrificing the creature token, adding
4. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite self-discard triggers