How can you create a combo with Necropotence, Vizkopa Guildmage, Oketra's Last Mercy?
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[START OF COMBO]This combo can be formed with Necropotence, Vizkopa Guildmage, Oketra's Last Mercy

Color identity: WB
Mana cost: {2}{W}{W}{W}{B}
Steps:
  1. Activate Vizkopa Guildmage by paying {1}{W}{B}, causing each opponent to lose life whenever you gain life this turn.
  2. Activate Necropotence by paying 1 life, exiling the top card of your library.
  3. Repeat step 2 until you have one life.
  4. Cast Oketra's Last Mercy by paying {1}{W}{W}, causing your life total to become forty.
  5. Vizkopa Guildmage triggers, causing each opponent to lose thirty-nine life.
  6. Each opponent loses the game due to having zero or less life.[END OF COMBO STEPS]

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

Other prerequisites:
  - Necropotence must be on the battlefield
  - Vizkopa Guildmage must be on the battlefield
  - Oketra's Last Mercy must be in your hand
  - Each opponent has a life total that is less than forty.
[END OF COMBO PREREQUISITES]
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