Om Nom Nom is a Weiß Schwarz card from Booster Pack The Eminence in Shadow EIS/SX07-055. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
Choose up to 1 《Eminence in Shadow》 character in your waiting room, return it to your hand, choose up to 1 "War Goddess, Beatrix" in your hand, put it in any position of your stage, and that character gets +4000 power until end of turn.