合奏コンクール is a Weiß Schwarz card from ガールフレンド（仮） Vol.2 GF/W38-070. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
【AUTO】 When this card is placed on your climax area from your hand, draw a card, choose one of your characters, and that character gets +2000 power and +1 soul until end of turn.