How can you create a combo with Walking Ballista, Unspeakable Symbol, Insult // Injury, Quest for Pure Flame?
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[START OF COMBO]This combo can be formed with Walking Ballista, Unspeakable Symbol, Insult // Injury, Quest for Pure Flame

Color identity: BR
Mana cost: {2}{R}
Steps:
  1. Activate Quest for Pure Flame by removing four quest counters from it and sacrificing it, doubling all damage dealt by sources you control this turn.
  2. Cast Insult by paying {2}{R}, doubling all damage dealt by sources you control this turn.
  3. Give Walking Ballista lifelink, if needed.
  4. If Walking Ballista has less than two +1/+1 counters on it, activate Unspeakable Symbol by paying 3 life, putting a +1/+1 counter on Walking Ballista.
  5. Activate Walking Ballista's second ability by removing a +1/+1 counter from it, dealing 4 damage to an opponent or a permanent an opponent controls, and causing you to gain 4 life.
  6. Repeat from step 4.[END OF COMBO STEPS]

Result:
  - Infinite damage
  - Infinite lifegain triggers
  - Infinite lifegain
  - Infinite +1/+1 counters[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Walking Ballista must be on the battlefield
  - Unspeakable Symbol must be on the battlefield
  - Insult // Injury must be in your hand
  - Quest for Pure Flame must be on the battlefield
  - Quest for Pure Flame has at least four quest counters on it.
  - You have a way to give Walking Ballista lifelink.
  - Walking Ballista has at least two +1/+1 counters on it, or your life total is at least 4.
[END OF COMBO PREREQUISITES]
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