How can you create a combo with Gyruda, Doom of Depths, Mortuary, Phantasmal Image?
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[START OF COMBO]This combo can be formed with Gyruda, Doom of Depths, Mortuary, Phantasmal Image

Color identity: UB
Mana cost: {1}{U}
Steps:
  1. Cast Phantasmal Image by paying {1}{U}, having it enter the battlefield as a copy of Gyruda.
  2. Put Phantasmal Image into your graveyard due to the legend rule.
  3. Mortuary triggers, putting Phantasmal Image on top of your library from your graveyard.
  4. Phantasmal Image's enter the battlefield ability triggers, causing each player to mill four cards and you to return Phantasmal Image from your graveyard to the battlefield as a copy of Gyruda.
  5. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mill
  - Infinite sacrifice triggers
  - Infinite self-mill[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Gyruda, Doom of Depths must be on the battlefield
  - Mortuary must be on the battlefield
  - Phantasmal Image must be in your hand
[END OF COMBO PREREQUISITES]
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