How can you create a combo with Gideon of the Trials, Magus of the Mirror, Necropotence?
user
[START OF COMBO]This combo can be formed with Gideon of the Trials, Magus of the Mirror, Necropotence

Color identity: WB
Mana cost: 
Steps:
  1. During your upkeep, activate Necropotence by paying 1 life, exiling the top card of your library face down.
  2. Repeat step 1 until you have zero life.
  3. Activate Magus of the Mirror by tapping and sacrificing it, exchanging your life total with an opponent.
  4. The opponent loses the game due to having zero life.[END OF COMBO STEPS]

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

Other prerequisites:
  - All permanants must be on the battlefield
  - You have earned Gideon's emblem.
[END OF COMBO PREREQUISITES]
assistant