音楽室の戦い オカルン is a Weiß Schwarz card from TVアニメ『ダンダダン』Vol.2 DDD/S129-016. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
【CONT】 During your turn, this gets +2000 power. 【AUTO】 {CX Combo} When the Choice CX (025) is placed in your CX Area, if you have another 《Human》 or 《Strange》 character, choose 1 of your other characters, this turn, it gains the following ability, "【AUTO】 When this card's battle opponent is Reversed, search your deck for up to 1 《Human》 or 《Strange》 character, show it to your opponent, add it to hand, and shuffle your deck afterwards."
This card was printed in Japanese only; the English text above is an unofficial community translation.