Maʿūnah is extraordinary help given to a believer without implying a prophetic or saintly office. Istidrāj denotes favorable appearances that deepen the delusion of a wrongdoer. Ihānah exposes and humiliates a false claimant.
Siḥr involves special operative causes, techniques or deceptive appearances. Even where it seems extraordinary, it does not establish revelation, because it lacks the proper connection with verification of a prophetic mission.
The issue is not simply whether something astonishes observers; it is who is involved, what claim is made and whether the occurrence confirms or refutes that claim.