Eta is a Weiß Schwarz card from Booster Pack The Eminence in Shadow EIS/SX07-P08. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
【CONT】 This card can be played from your hand without fulfilling color requirements. 【CONT】 If you have 2 or more other 《Eminence in Shadow》 characters, this card gets +2500 power and "【AUTO】 Encore [Put 1 character from your hand into your waiting room]".