Mairsil, the Pretender, Cinderhaze Wretch, Endling, and Phyrexian Altar

Prerequisites

• Mairsil, the Pretender on the battlefield
• Cinderhaze Wretch in exile
• Endling in exile
• Phyrexian Altar on the battlefield or in exile
• undefined available

Steps

1. Activate Mairsil using Endling's third ability by paying , gaining Mairsil undying
2. Activate Mairsil using Phyrexian Altar's ability by sacrificing Mairsil, adding
3. Mairsil's undying ability triggers, returning it to the battlefield
4. Activate Mairsil using Cinderhaze Wretch's ability, putting -1/-1 on itself
5. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers