[CONT]: Sentinel [AUTO]: [Counter Blast (1)] When this unit is placed on (GC) from hand, if you have a vanguard with "Star-vader" in its card name, you may pay the cost. If you do, call five cards from the top of your deck to (GC). At the end of that battle, if the attack did not hit, your opponent chooses one of his or her rear-guards, and locks it.