How can you create a combo with Adarkar Valkyrie, Intruder Alarm, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Adarkar Valkyrie, Intruder Alarm, Altar of Dementia

Color identity: WU
Mana cost: 
Steps:
  1. Activate Adarkar Valkyrie by tapping it, targeting another nontoken creature you control.
  2. Activate Altar of Dementia by sacrificing the creature targeted in step 1.
  3. When the creature dies, Adarkar Valkyrie triggers, returning the sacrificed creature from your graveyard to the battlefield.
  4. When the creature enters the battlefield, Intruder Alarm triggers, untapping all creatures.
  5. Resolve the Altar of Dementia ability, causing target player to mill cards equal to the sacrificed creature's power.
  6. Repeat.[END OF COMBO STEPS]

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

Other prerequisites:
  - All permanants must be on the battlefield
  - Adarkar Valkyrie does not have summoning sickness.
  - You control at least one additional nontoken creature.
[END OF COMBO PREREQUISITES]
assistant