Carmen, Cruel Skymarcher, Cult Conscript, Phyrexian Altar, and Davvol, Evincar of Rath

Prerequisites

• Carmen, Cruel Skymarcher on the battlefield
• Cult Conscript in the graveyard
• Phyrexian Altar on the battlefield
• Davvol, Evincar of Rath on the battlefield
• available

Steps

1. Activate Phyrexian Altar by sacrificing Cult Conscript, adding When Cult Conscript dies, Carmen triggers, causing you to gain 1 life and put a +1/+1 counter on Carmen Activate Cult Conscript by paying , returning it from your graveyard to the battlefield
2. When Cult Conscript enters, Davvol triggers, adding and causing you to lose 1 life
3. Repeat

Results

• Infinite +1/+1 counters on a creature
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite lifegain triggers