How can you create a combo with Greven, Predator Captain, Necropotence?
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[START OF COMBO]This combo can be formed with Greven, Predator Captain, Necropotence

Color identity: BR
Mana cost: 
Steps:
  1. Activate Necropotence by paying 1 life, exiling the top card of your library and giving Greven +1/+1 until end of turn due to its first ability.
  2. Repeat step 1 until Greven is a 21/21 creature.
  3. Deal combat damage to an opponent using Greven.
  4. The opponent loses the game due to being dealt 21 combat damage from your commander.[END OF COMBO STEPS]

Result:
  - Target opponent loses the game[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Greven does not have summoning sickness and cannot be blocked by an opponent.Your life total is at least 17.
[END OF COMBO PREREQUISITES]
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