Artemis replacing Iphigeneia with a deer, the animal most sacred to her, demonstrates her satisfaction with the sacrifice and her ability to see Iphigeneia as someone beloved and revered. This ending is a classic
deus ex machina, in which an impossible situation is solved by a hasty, unlikely intervention by the gods themselves. Clytemnestra is unsatisfied with such an ending—she doesn’t have her daughter back, and her husband is going to get away with having betrayed them both.