一番の宝物 ユイ is a Weiß Schwarz card from プレミアムブースター Key 25th Anniversary Kab/WE50-14. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
【AUTO】 When this is placed on stage from hand, you may Heal 1. 【AUTO】 {CX Combo} [(2) Discard 1 card] When this attacks, if you have "A Girl's Ultimate Happiness - AB/W31-E054" in your CX Area, and you have 2 or more other 《Music》 characters, you may pay cost. If you do, deal 1 damage to your opponent, mill 1, then deal X damage to your opponent. X equals the Level of the milled card +1.
This card was printed in Japanese only; the English text above is an unofficial community translation.