Carmen, Cruel Skymarcher, Bloodsoaked Champion, Carnival of Souls, and Phyrexian Altar

Prerequisites

• Carmen, Cruel Skymarcher on the battlefield
• Bloodsoaked Champion in the graveyard
• Carnival of Souls on the battlefield
• Phyrexian Altar on the battlefield
• available

Steps

1. Activate Phyrexian Altar by sacrificing Bloodsoaked Champion, adding When Bloodsoaked Champion dies, Carmen triggers, causing you to gain 1 life and put a +1/+1 counter on Carmen Activate Bloodsoaked Champion by paying , returning it from your graveyard to the battlefield
2. When Bloodsoaked Champion enters, Carnival of Souls 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