Knife is a Weiß Schwarz card from 初音ミク -Project DIVA- F 2nd PD/S29-112. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
Search your deck for up to one card named "Kagamine Len"Thorned Rose"" and up to one card named "Kagamine Rin"Sunflower"" and up to one card named "Hatsune Miku"Moonlight Butterfly"", reveal them to your opponent, put them into your hand, choose a card in your hand, and put it into your waiting room. Shuffle your deck afterwards.