How can you create a combo with Mairsil, the Pretender, Cinderhaze Wretch, Endling, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Mairsil, the Pretender, Cinderhaze Wretch, Endling, Phyrexian Altar

Color identity: UBR
Mana cost: {B}
Steps:
  1. Activate Mairsil using Endling's third ability by paying {B}, gaining Mairsil undying.
  2. Activate Mairsil using Phyrexian Altar's ability by sacrificing Mairsil, adding {B}.
  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.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Mairsil, the Pretender must be on the battlefield
  - Cinderhaze Wretch must be exiled
  - Endling must be exiled
  - Phyrexian Altar must be on the battlefield or exiled
  - Cinderhaze Wretch and Endling each have a cage counter on them.
  - Phyrexian Altar on the battlefield or in exile with a cage counter on it.
[END OF COMBO PREREQUISITES]
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