reason why you can play 'for free'

target of play 'for free'

Bio-Neural Gel Pack
May report aboard your Intrepid-class ship (for free on U.S.S. Voyager). While on your Intrepid-class ship or Delta Flyer, enhances its attributes all +1. (Cumulative up to +3.)

Bio-Neural Gel Pack

Jem’Hadar Birthing Chamber
Where present, each of your Jem’Hadar Birthing Chambers allows you to report one Young Jem’Hadar (for free) each turn, regardless of quadrant.

Young Jem’Hadar

Kazon Disruptor
Kazon use only. Reports for free (once each turn). Each of your personnel present is STRENGTH +2. (Cumulative.)

Kazon Disruptor

Kazon Disruptor Rifle
Kazon use only. Reports for free (once each turn). Each of your personnel present is STRENGTH +3, but loses 1 Diplomacy unless aboard your ship. (Cumulative.)

Kazon Disruptor Rifle

Maturation Chamber
Once each turn, you may download to Chamber one drone in place of one card draw OR report to Chamber one drone (for free).

Calibration Drone, Computation Drone, Eighteen of Nineteen, Eight of Eighteen, Eight of Fifteen, Eight of Nineteen, Eleven of Eighteen, Eleven of Nineteen, Eleven of Seventeen, Eleven of Twelve, Fifteen of Seventeen, Five of Eleven, Four of Eleven, Nine of Eleven, Nine of Fifteen, Nine of Twelve, One of Eleven, Reclamation Drone, Reconnaissance Drone, Requisitions Drone, Seven of Nine, Seventeen of Eighteen, Six of Eleven, Six of Nineteen, Six of Seventeen, Six of Thirteen, Six of Twelve, Sixteen of Nineteen, Ten of Nineteen, Third of Five, Thirteen of Nineteen, Three of Nineteen, Two of Eleven, Two of Nineteen, Two of Seventeen, Two of Twelve

Mirror Dagger
Each of your personnel present is STRENGTH +1. (Cumulative.) May report to a facility for free OR to a just-initiated personnel battle involving your card(s).

Mirror Dagger

Scepter of the Grand Nagus
Your Nagus present may allow one card to play for free each turn, prevent opponent from nullifying cards here and stun one adversary he just engaged per turn. (Unique.)

1st Rule of Acquisition, 6th Rule of Acquisition, 33rd Rule of Acquisition, 34th Rule of Acquisition, 35th Rule of Acquisition, 47th Rule of Acquisition, 59th Rule of Acquisition, 62nd Rule of Acquisition, 75th Rule of Acquisition, 211th Rule of Acquisition

Starfleet Type I Phaser
Federation use only. Reports for free. Each of your personnel present is STRENGTH +1. (Cumulative.) May report to a just-initiated personnel battle involving your card(s).

Starfleet Type I Phaser