Disempowering affects only cards that are currently Empowered. 1. Game effects that instruct a player to Disempower a card that is not currently Empowered will do nothing.
§ 442.1.a Core Rules PDF (officieel)
§ 442 Disempower
§ 442.1 Disempowering is the act of removing the Empowered status from one or more Game Objects.
