[CONT]: Sentinel [AUTO]:[Choose a card from your hand, and discard it] When this unit is placed on (GC) from hand, you may pay the cost. If you do, choose one of your units with "Blue Wave" in its card name, and it cannot be hit until end of that battle. [ACT](Drop Zone) Generation Break 1 :[Bind this card face up] Choose one of your rear-guards with "Blue Wave" in its card name, and until end of turn, it gets"[CONT](RC):This unit can attack from the back row.".