About this card
When this card is activated: You can add 1 "K9" monster from your Deck to your hand. "K9" monsters you control gain 900 ATK during any turn in which your opponent has activated a monster effect in the hand or GY. If this card in the Spell & Trap Zone is destroyed by card effect: You can Set 1 "K9" Quick-Play Spell from your Deck or GY. You can only use this effect of ""A Case for K9"" once per turn. You can only activate 1 ""A Case for K9"" per turn.
The passcode identifies the card, not one physical printing. Also check set code, rarity, edition, language and condition.
Raw TCG restriction recorded in the catalogue on Nov 4, 2026. This does not establish current tournament legality.