Deathgreeter, Reassembling Skeleton, Carnival of Souls, and Phyrexian Altar

Prerequisites

• Deathgreeter on the battlefield
• Reassembling Skeleton in the graveyard
• Carnival of Souls on the battlefield
• Phyrexian Altar on the battlefield
• available

Steps

1. Activate Phyrexian Altar by sacrificing Reassembling Skeleton, adding When Reassembling Skeleton dies, Deathgreeter triggers, causing you to gain 1 life Activate Reassembling Skeleton by paying , returning it from your graveyard to the battlefield
2. When Reassembling Skeleton 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