Protection Charm

[CONT]:This card cannot be played. [ACT](Hand):[COST][Reveal this card], choose one of your rear-guards without Protection Charm gauge, and if you chose a unit, put this card as that unit's Protection Charm gauge face up. [CONT]Gauge Zone:During your opponent's turn, when a unit with this card as its Protection Charm gauge would leave a (RC) other than for cost, you may discard this card. If you do, that unit stays on the (RC).