歌姫の共演 マリア is a Weiß Schwarz card from 戦姫絶唱シンフォギアＧＸ SG/W39-064. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
【AUTO】 When your other 《Music》 character attacks, this card gets +1500 power until end of turn. 【AUTO】 Encore [Put 1 character from your hand into your waiting room] (When this card is put into your waiting room from the stage, you may pay the cost. If you do, return this card to its previous stage position as 【REST】)