How can you create a combo with Fall of Cair Andros, Star of Extinction?
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[START OF COMBO]This combo can be formed with Fall of Cair Andros, Star of Extinction

Color identity: R
Mana cost: {5}{R}{R}
Steps:
  1. Cast Star of Extinction by paying {5}{R}{R}, destroying target land, and then dealing 20 damage to each creature and each planeswalker.
  2. For each creature opponents control that is dealt excess damage, Fall of Cair Andros triggers, creating a 0/0 Army if you dont control one, and putting a number of +1/+1 counters on an Army you control equal to the excess damage.[END OF COMBO STEPS]

Result:
  - Near-infinite +1/+1 counters on an Army token
  - Near-infinite damage to all creatures[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Fall of Cair Andros must be on the battlefield
  - Star of Extinction must be in your hand
  - An opponent controls a creature with toughness less than twenty.
[END OF COMBO PREREQUISITES]
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