How can you create a combo with Rograkh, Son of Rohgahh, Rakdos, Lord of Riots, Goblin Bombardment, Blood Artist?
user
[START OF COMBO]This combo can be formed with Rograkh, Son of Rohgahh, Rakdos, Lord of Riots, Goblin Bombardment, Blood Artist

Color identity: BR
Mana cost: 
Steps:
  1. Cast Rograkh for {0}.
  2. Activate Goblin Bombardment by sacrificing Rograkh.
  3. Choose to have Rograkh return from the graveyard to the command zone.
  4. Blood Artist triggers, causing an opponent to lose 1 life and you to gain 1 life.
  5. Resolve Goblin Bombardment's ability, dealing 1 damage to any opponent.
  6. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite commander casts
  - Infinite damage
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite lifegain
  - Infinite lifegain triggers
  - Infinite lifeloss
  - 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 the command zone
  - Rakdos, Lord of Riots must be on the battlefield
  - Goblin Bombardment must be on the battlefield
  - Blood Artist must be on the battlefield
  - The amount of life opponents have lost this turn is equal to or greater than Rograkh's commander tax.
[END OF COMBO PREREQUISITES]
assistant