Your search for "Castle Walls SDP-043" revealed the following:
Castle Walls - SDP-043 - Common - 1st Edition from Starter Deck: Pegasus 1st Edition, available at 401 Games Canada. Rarity: Common Card Text:Increase a selected monster's DEF by 500 points during the turn this card is activated.
Castle Walls - SDP-043 - Common - Unlimited from Starter Deck: Pegasus Unlimited, available at 401 Games Canada. Rarity: Common Card Text:Increase a selected monster's DEF by 500 points during the turn this card is activated.
Castle Walls - SDJ-045 - Common - Unlimited from Starter Deck: Joey Unlimited, available at 401 Games Canada. Rarity: Common Card Text:Increase a selected monster's DEF by 500 points during the turn this card is activated.
Castle Walls - SDJ-045 - Common - 1st Edition from Starter Deck: Joey 1st Edition, available at 401 Games Canada. Rarity: Common Card Text:Increase a selected monster's DEF by 500 points during the turn this card is activated.
Castle Walls - SDK-049 - Common - 1st Edition from Starter Deck: Kaiba 1st Edition, available at 401 Games Canada. Rarity: Common Card Text:Increase a selected monster's DEF by 500 points during the turn this card is activated.