How can you create a combo with Yedora, Grave Gardener, Primordial Mist, Walking Ballista?
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[START OF COMBO]This combo can be formed with Yedora, Grave Gardener, Primordial Mist, Walking Ballista

Color identity: GU
Mana cost: 
Steps:
  1. Cast Walking Ballista for {X} = 0.
  2. Walking Ballista dies to having zero toughness.
  3. Yedora triggers, returning it to the battlefield face-down as a Forest land.
  4. Tap that Forest for {G}.
  5. Activate Primordial Mist by exiling the face-down Walking Ballista, and allowing you to cast it this turn.
  6. Repeat.
  7. Once you have infinite {G}, you may cast Walking Ballista using an arbitrarily large amount of mana, and then use its second ability to deal an arbitrarily large amount of damage to any target(s).[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters on Walking Ballista
  - Infinite damage
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite green mana
  - Infinite landfall triggers
  - Infinite leaves the battlefield
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Yedora, Grave Gardener must be on the battlefield
  - Primordial Mist must be on the battlefield
  - Walking Ballista must be in your hand
[END OF COMBO PREREQUISITES]
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