Carnival of Souls, Cult Conscript, Panicked Bystander // Cackling Culprit, and Phyrexian Altar

Prerequisites

• Carnival of Souls on the battlefield
• Cult Conscript in the graveyard
• Panicked Bystander // Cackling Culprit on the battlefield
• Phyrexian Altar on the battlefield
• available

Steps

1. Activate Phyrexian Altar by sacrificing Cult Conscript, adding When Cult Conscript dies, Panicked Bystander // Cackling Culprit triggers, causing you to gain 1 life Activate Cult Conscript by paying , returning it from your graveyard to the battlefield
2. When Cult Conscript enters, Carnival of Souls triggers, adding and causing you to lose 1 life
3. Repeat

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite lifegain triggers