Monkey Flute is a Weiß Schwarz card from Batman Ninja BNJ/SX01-057. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
Choose 1 of your 【STAND】 《Weapon》 characters, and 【REST】 it. If you do, search your deck for up to 2 "Monkey Horde", put them on separate positions of your stage, and shuffle your deck.