How can you create a combo with Twilight's Call, Intruder Alarm, Mnemonic Wall, Deathbloom Ritualist, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Twilight's Call, Intruder Alarm, Mnemonic Wall, Deathbloom Ritualist, Altar of Dementia

Color identity: BGU
Mana cost: {2} (at most)
Steps:
  1. Activate Altar of Dementia by sacrificing Mnemonic Wall, causing target player to mill cards equal to Mnemonic Wall's power.
  2. Activate Deathbloom Ritualist by tapping it, adding at least {B}{B}{B}{B}.
  3. Cast Twilight's Call by paying {4}{B}{B}, causing each player to return all creature cards from their graveyard to the battlefield.
  4. Mnemonic Wall and each creature enters the battlefield, triggering Intruder Alarm that many times and Mnemonic Wall once.
  5. Holding priority, activate Altar of Dementia by sacrificing another nontoken creature, causing target player to mill cards equal to the sacrificed creature's power.
  6. Resolve the Mnemonic Wall trigger, causing you to return Twilight's Call from your graveyard to your hand.
  7. Resolve the first Intruder Alarm trigger, untapping all creatures.
  8. Activate Deathbloom Ritualist by tapping it, adding at least one mana of any color.
  9. Repeat from step 7 for each remaining trigger.
  10. Activate Altar of Dementia by sacrificing another nontoken creature, causing target player to mill cards equal to the sacrificed creature's power.
  11. Repeat step 10 until you have at least six creature cards in your graveyard.
  12. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite magecraft triggers
  - Infinite mana creatures you control can produce
  - Infinite mill
  - Infinite sacrifice triggers
  - Infinite self-mill
  - Infinite storm count
  - Infinite untap of all creatures[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Twilight's Call must be in your hand
  - Intruder Alarm must be on the battlefield
  - Mnemonic Wall must be on the battlefield
  - Deathbloom Ritualist must be on the battlefield
  - Altar of Dementia must be on the battlefield
  - Deathbloom Ritualist does not have summoning sickness.
  - You have at least three creature cards in your graveyard.
[END OF COMBO PREREQUISITES]
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