How can you create a combo with Shay Cormac, Agatha's Soul Cauldron, Walking Ballista?
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[START OF COMBO]This combo can be formed with Shay Cormac, Agatha's Soul Cauldron, Walking Ballista

Color identity: WB
Mana cost: 
Steps:
  1. Give Shay Cormac deathtouch, if needed.
  2. Activate Shay Cormac using Walking Ballista's second ability by removing a +1/+1 counter from it, targeting a creature an opponent controls.
  3. Shay Cormac's first ability triggers, putting a bounty counter on the targeted creature.
  4. Resolve the Shay Cormac ability from step 2, dealing 1 damage to the creature and killing it due to Shay Cormac's deathtouch.
  5. When the creature dies, Shay Cormac's second ability triggers, putting two +1/+1 counters on it.
  6. Repeat from step 2.
  7. If the method giving Shay Cormac deathtouch lasts indefinitely, you may repeat this loop whenever a creature enters the battlefield under an opponent's control.[END OF COMBO STEPS]

Result:
  - Destroy all creatures that enter the battlefield under an opponent's control
  - Destroy all creatures opponents control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Shay Cormac must be on the battlefield
  - Agatha's Soul Cauldron must be on the battlefield
  - Walking Ballista must be exiled
  - Shay Cormac has at least one +1/+1 counter on it.
  - You have a way to give Shay Cormac deathtouch.
[END OF COMBO PREREQUISITES]
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