How can you create a combo with Rograkh, Son of Rohgahh, Bolas's Citadel, Mortuary, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Rograkh, Son of Rohgahh, Bolas's Citadel, Mortuary, Phyrexian Altar

Color identity: BR
Mana cost: 
Steps:
  1. Cast Rograkh either from your hand, from the command zone or from the top of your library by paying {0} plus commander tax, if applicable.
  2. Activate Phyrexian Altar by sacrificing Rograkh, adding one mana of any color.
  3. When Rograkh dies, Mortuary triggers, putting Rograkh from your graveyard on top of your library.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Rograkh, Son of Rohgahh must be in your hand or in the command zone or in the library
  - Bolas's Citadel must be on the battlefield
  - Mortuary must be on the battlefield
  - Phyrexian Altar must be on the battlefield
  - You have enough mana to pay for commander tax if Rograkh is your commander.
[END OF COMBO PREREQUISITES]
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