Bloodsoaked Champion, Vindictive Vampire, Carnival of Souls, and Phyrexian Altar

Prerequisites

• Bloodsoaked Champion on the battlefield
• Vindictive Vampire on the battlefield
• 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, Vindictive Vampire triggers, causing you to gain 1 life and dealing 1 damage to each opponent 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 creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite damage
• Infinite death triggers
• Infinite lifegain triggers