Card Text:
[CONT]:Sentinel (You may only have up to four cards with "[CONT]:Sentinel" in a deck.)
[AUTO]:[Choose an {Aqua Force} from your hand, and discard it] When this unit is placed on (GC), you may pay the cost. If you do, choose one of your {Aqua Force} that is being attacked, and that unit cannot be hit until end of that battle.