Ghostly Dancers + Intruder Alarm + Marina Vendrell

WUBRG identity

Commander legal

The 3 combo pieces

What must be in place

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.

How to execute it

  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.

What the combo produces