How can you create a combo with Marina Vendrell, Ghostly Dancers, Intruder Alarm?
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[START OF COMBO]This combo can be formed with Marina Vendrell, Ghostly Dancers, Intruder Alarm

Color identity: WUBRG
Mana cost: 
Steps:
  1. Activate any number of creatures you control by tapping them, adding at least enough mana to unlock a locked Room you control.
  2. Unlock any Room you control by paying its mana cost.
  3. Ghostly Dancers' second ability triggers, creating a 3/1 Spirit creature token. 
  4. When the Spirit enters the battlefield, Intruder Alarm triggers, untap all creatures.
  5. Activate Marina by tapping it, locking the Room that was unlocked in step 1.
  6. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite enters the battlefield
  - Infinite creature tokens
  - Infinite untap of all creatures
  - Infinite mana creatures you control can produce
  - Infinite unlocking of Rooms you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - The Room has one half locked, and the other half unlocked.
  - Creatures you control can tap to produce enough mana to unlock the locked Room.
  - Marina does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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