How can you create a combo with Gyruda, Doom of Depths, Mortuary, Ashnod's Altar?
user
[START OF COMBO]This combo can be formed with Gyruda, Doom of Depths, Mortuary, Ashnod's Altar

Color identity: UB
Mana cost: {4}{U/B}{U/B} plus enough mana to pay for commander tax, if applicable
Steps:
  1. Cast Gyruda by paying {4}{U/B}{U/B} and commander tax, if applicable.
  2. Gyruda enters the battlefield, triggering its ability.
  3. Holding priority, activate Ashnod's Altar by sacrificing Gyruda, adding {C}{C}.
  4. Gyruda dies, triggering Mortuary, putting Gyruda on top of your library from your graveyard.
  5. Resolve the Gyruda ability from step 2, causing each player to mill four cards and you to return Gyruda from your graveyard to the battlefield.
  6. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - 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 in your hand or in the command zone
  - Mortuary must be on the battlefield
  - Ashnod's Altar must be on the battlefield
[END OF COMBO PREREQUISITES]
assistant