How can you create a combo with Vraska, Swarm's Eminence, Walking Ballista?
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[START OF COMBO]This combo can be formed with Vraska, Swarm's Eminence, Walking Ballista

Color identity: BG
Mana cost: 
Steps:
  1. Give Walking Ballista deathtouch.
  2. Activate Walking Ballista's second ability by removing a +1/+1 counter from it, dealing 1 damage to an opponent.
  3. Vraska triggers, putting a +1/+1 counter on Walking Ballista.
  4. Repeat steps 2-3.[END OF COMBO STEPS]

Result:
  - Infinite damage[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Walking Ballista has at least two +1/+1 counters.
  - You have a way to give Walking Ballista deathtouch.
[END OF COMBO PREREQUISITES]
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