Embalmer's Tools, Phyrexian Altar, Desecrated Tomb, and Gutterbones

Prerequisites

• Embalmer's Tools on the battlefield
• Phyrexian Altar on the battlefield
• Desecrated Tomb on the battlefield
• Gutterbones on the battlefield
• An opponent lost life this turn

Steps

1. Activate Phyrexian Altar by sacrificing Gutterbones, adding
2. Activate Gutterbones by paying , returning it to your hand
3. Desecrated Tomb trigger, creating a 1/1 Bat token
4. Activate Phyrexian Altar by sacrificing a Bat token, adding
5. Cast Gutterbones by paying
6. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers