'for free' - Romulan Ship cards.
Romulan Ship cards that could be played for free.
target of play 'for free'
reason why you can play 'for free'
Battle Cruiser D-7 Class 6 / 5 / 5 Cloaking Device / Tractor Beam Special skill: Any Klingon or Romulan.
Deep Space Station K-7
Gal Gath’thong Romulan Bird-Of-Prey 5 / 7 / 6 Cloaking Device / Tractor Beam Special skill: Any Romulan personnel.
D-7 Class 6 / 5 / 5
Cloaking Device / Tractor Beam
Any 
Klingon or Romulan.