How can you create a combo with Mairsil, the Pretender, Endling, Blood Vassal, Triskelavus?
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[START OF COMBO]This combo can be formed with Mairsil, the Pretender, Endling, Blood Vassal, Triskelavus

Color identity: UBR
Mana cost: {B}
Steps:
  1. Activate Mairsil using Endling's third ability by paying {B}, giving Mairsil undying until end of turn.
  2. Activate Mairsil using Blood Vassal's ability by sacrificing it, adding {B}{B}.
  3. Mairsil dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  4. Activate Mairsil using Triskelavus' ability by paying {1} and removing the +1/+1 counter from it, creating a 1/1 Triskelavite artifact creature token.
  5. Repeat.
  6. Once you have infinite Triskelavite tokens, you may sacrifice them to deal infinite damage to any target(s).[END OF COMBO STEPS]

Result:
  - Infinite creature tokens
  - Infinite damage
  - 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
  - Endling must be exiled
  - Blood Vassal must be exiled
  - Triskelavus must be exiled
  - Mairsil does not have a +1/+1 counter on it.
[END OF COMBO PREREQUISITES]
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