The phrase "spell-caught" can be replaced by a number of different synonyms, depending on the context in which it is being used. One possible replacement might be "bewitched," which implies a sense of being under some kind of supernatural or magical influence. Another option might be "enraptured," which suggests a sense of being captivated or transported by something amazing or sublime. Still other possible synonyms might include "ensnared," "captivated," "enamored," or "enthralled," all of which suggest a sense of being caught up or consumed by something beyond one's control or understanding. Ultimately, the choice of synonym will depend on the specific situation and the intended meaning of the phrase.