It Was a Disguise! is a Weiß Schwarz card from Batman Ninja BNJ/SX01-058. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
Choose 1 of your 《Villain》 characters, and put it into your waiting room. If you do, choose 1 character in your waiting room with level equal to or lower than your level with "Harley Quinn" in its card name, and put it on any position of your stage.