How can you create a combo with Druid's Call, Cathars' Crusade, Walking Ballista, Doubling Season?
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[START OF COMBO]This combo can be formed with Druid's Call, Cathars' Crusade, Walking Ballista, Doubling Season

Color identity: GW
Mana cost: 
Steps:
  1. Activate Walking Ballista's first ability by removing a +1/+1 counter from it, dealing 1 damage to itself.
  2. Druid's Call triggers, creating two 1/1 Squirrel creature tokens.
  3. The Squirrels enters the battlefield, triggering Cathars' Crusade twice, putting four +1/+1 counters on each creature you control.
  4. Repeat.
  5. Once you have infinite +1/+1 counters on Walking Ballista, you may remove them to deal infinite damage to any target(s).[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters
  - Infinite creature tokens
  - Infinite damage
  - Infinite enters the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Druid's Call attached to Walking Ballista.
  - Walking Ballista has at least three +1/+1 counters.
[END OF COMBO PREREQUISITES]
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