"(•̀ u •́)━☆.*," is an emote that typically represents a feeling of excitement or happiness, often used to express a sense of accomplishment or success. "Using my magic" emote can refer to a variety of things depending on the context, but generally implies that the user is performing some sort of action with skill or expertise. It can also be used playfully or ironically to suggest that the user is using their abilities in a humorous or exaggerated way.