Your search for "Cyberdark Realm SDCS-EN023" revealed the following:
Cyberdark Realm - SDCS-EN023 - Ultra Rare - Unlimited from Structure Deck: Cyber Strike Unlimited, available at 401 Games Canada. Rarity: Ultra Rare Card Text:When this card is activated: You can add 1 "Cyberdark" monster from your Deck to your...
Cyberdark Realm - SDCS-EN023 - Ultra Rare - 1st Edition from Structure Deck: Cyber Strike 1st Edition, available at 401 Games Canada. Rarity: Ultra Rare Card Text:When this card is activated: You can add 1 "Cyberdark" monster from your Deck...