宝物になった日 is a Weiß Schwarz card from Key all-star Kdb/W102-068. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
Send all of your opponent's Stock to Waiting Room, send the same number of cards from the top of their Deck to Stock. Choose one of your Characters, during this turn, it gains +2000 Power. Send this card to Memory.
This card was printed in Japanese only; the English text above is an unofficial community translation.