[CONT]:Sentinel
[AUTO]:[Choose a card 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 units with "Blau" in its card name, and it cannot be hit until end of that battle. If there is a sentinel in your drop zone, choose up to one of your rear-guards with "Blau" in its card name, until end of turn, it gets "[CONT](RC):Resist" and "[CONT](RC):This unit cannot be hit."