How can you create a combo with Necrotic Ooze, Endling, Walking Ballista, Phyrexian Altar?
user
[START OF COMBO]This combo can be formed with Necrotic Ooze, Endling, Walking Ballista, Phyrexian Altar

Color identity: B
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 Walking Ballista's second ability by removing a +1/+1 counter from it, dealing 1 damage to any target.
  3. Repeat step 2 until Necrotic Ooze has no +1/+1 counters.
  4. Activate Phyrexian Altar by sacrificing Necrotic Ooze, adding {B}.
  5. Necrotic Ooze dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  6. Repeat.[END OF COMBO STEPS]

Result:
  - 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:
  - Necrotic Ooze must be on the battlefield
  - Endling must be in the graveyard
  - Walking Ballista must be in the graveyard
  - Phyrexian Altar must be on the battlefield
[END OF COMBO PREREQUISITES]
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