How can you create a combo with Necrotic Ooze, Endling, Phyrexian Altar, Fain, the Broker, Mass Hysteria?
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[START OF COMBO]This combo can be formed with Necrotic Ooze, Endling, Phyrexian Altar, Fain, the Broker, Mass Hysteria

Color identity: BR
Mana cost: {B}
Steps:
  1. Activate Necrotic Ooze using Endling's third ability by paying {B}, giving Necrotic Ooze undying until end of turn.
  2. If Necrotic Ooze has any +1/+1 counters, activate it using Fain's second ability by tapping it and removing a +1/+1 counter from it, creating a Treasure token.
  3. Activate Phyrexian Altar by sacrificing Necrotic Ooze, adding {B}.
  4. Necrotic Ooze dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  5. Repeat an arbitrarily large number of times.
  6. Activate Necrotic Ooze using Fain's third ability by tapping it and sacrificing a Treasure token, creating a 2/1 Inkling creature token.
  7. Activate four Treasure tokens by tapping and sacrificing them, adding {3}{B}.
  8. Activate Necrotic Ooze using Fain's fourth ability by paying {3}{B}, untapping it.
  9. Repeat from step 6.
  10. You may also use the infinite Inkling tokens to use Fain's first ability for infinite +1/+1 counters.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters
  - Infinite colored mana
  - Infinite creature tokens with haste
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite Treasure tokens[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Necrotic Ooze must be on the battlefield
  - Endling must be in the graveyard
  - Phyrexian Altar must be on the battlefield
  - Fain, the Broker must be in the graveyard
  - Mass Hysteria must be on the battlefield
[END OF COMBO PREREQUISITES]
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