Darkness that Lights Up Demise, Lacus Carina (G-FC04/038EN) (G-FC04)

[G guardian] (Usable when both fighters' vanguards are grade 3 or greater, and the number of face up G guardians in your G zone is three or less)-Opponent Turn's Guard Step-[Choose a card with "Heal" from your hand, and discard it] Call this card to your (GC) from face down.
[AUTO] Generation Break 1:[Counter Blast (1) & Choose a face down G guardian from your G zone, and turn it face up] When this unit is placed on (GC), you may pay the cost. If you do, choose up to three of your rear-guards, lock them, your opponent chooses a unit in his or her back row for each card that was locked, and locks it.