Seeing an oryx or wild cow in your dream symbolizes a great leader or a distinguished person. If you have this kind of dream, it suggests that you are connecting with someone who is serious, pious, and generally stands apart from society. This dream indicates the presence of someone in your life who can inspire you and provide you with a new perspective.
From Imam Muhammad Ibn Seerin's Dictionary of Dreams According to Islamic Inner Traditions â entry "Oryx" (page 313).
In a dream, all kinds of genus oryx of the wild large African and Asian antelopes with long and straight horns represent a great leader, a pious and a reclusive person though he does not follow the prophetic traditions, or he could be an ascetic, or an innovator. If one finds the eyeball of an oryx in a dream, it means that he will marry a chaste and a beautiful woman whose life will be short. If one's head becomes that of an oryx in a dream, it means prosperity, or that he will receive an appointment to a leadership position. (Also see Buffalo; Mountain goat)
Note: Islamic dream interpretation depends on the dreamer's circumstances and state. This is a general guide drawn directly from the source book.