Chainer, Dementia Master, Wurmcoil Engine, Phyrexian Altar, and Carmen, Cruel Skymarcher

Prerequisites

• Chainer, Dementia Master on the battlefield
• Wurmcoil Engine on the battlefield
• Phyrexian Altar on the battlefield
• Carmen, Cruel Skymarcher on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Wurmcoil Engine, adding
2. When Wurmcoil Engine dies, it and Carmen trigger
3. Resolve the Wurmcoil Engine trigger, creating two 3/3 Wurm artifact creature tokens
4. Resolve the Carmen trigger, causing you to gain 1 life and put a +1/+1 counter on it
5. Activate Phyrexian Altar twice by sacrificing the Wurm tokens, adding
6. When the Wurms die, Carmen trigger twice, causing you to gain 2 life and put two +1/+1 counters on it
7. Activate Chainer by paying and 3 life, putting Wurmcoil Engine from your graveyard onto the battlefield
8. Repeat

Results

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