宝物の一枚 is a Weiß Schwarz card from ご注文はうさぎですか？？ ～Dear My Sister～ GU/W57-096. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
【CXCOMBO】 If 「宝物がいっぱい」 is in your Memory, search your Deck for up to 4 Characters with 「宝物」 in its name and show them to opponent, add them to Hand, choose 4 cards from your Hand, place them into Waiting Room, shuffle your Deck afterwards, choose up to 4 cards from your opponent's Waiting Room, return them to Deck, shuffle his/her Deck afterwards.
This card was printed in Japanese only; the English text above is an unofficial community translation.