Your search for "Cyber Dragon Core SDCS-EN008" revealed the following:
Cyber Dragon Core - SDCS-EN008 - Common - 1st Edition from Structure Deck: Cyber Strike 1st Edition, available at 401 Games Canada. Rarity: Common Card Text:This card's name becomes "Cyber Dragon" while on the field or in the GY. If...
Cyber Dragon Core - SDCR-EN001 - Super Rare - Unlimited from Structure Deck: Cyber Dragon Revolution Unlimited, available at 401 Games Canada. Rarity: Super Rare Card Text:When this card is Normal Summoned: Add 1 "Cyber" Spell/Trap Card from your Deck...
Cyber Dragon Core - SDCR-EN001 - Super Rare - 1st Edition from Structure Deck: Cyber Dragon Revolution 1st Edition, available at 401 Games Canada. Rarity: Super Rare Card Text:When this card is Normal Summoned: Add 1 "Cyber" Spell/Trap Card from...
Cyber Dragon Core - SDCS-EN008 - Common - Unlimited from Structure Deck: Cyber Strike Unlimited, available at 401 Games Canada. Rarity: Common Card Text:This card's name becomes "Cyber Dragon" while on the field or in the GY. If this card...