How can you create a combo with Walking Ballista, Unspeakable Symbol, Angrath's Marauders, Quest for Pure Flame?
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[START OF COMBO]This combo can be formed with Walking Ballista, Unspeakable Symbol, Angrath's Marauders, Quest for Pure Flame

Color identity: BR
Mana cost: 
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. Give Walking Ballista lifelink, if needed.
  3. 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.
  4. 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.
  5. Repeat from step 3.[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:
  - All permanants 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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