Mazal Tov?

It is known in Judaism that Jews are above any "predictionary techniques", which includes looking at the stars. Its in fact a curse for a Jew to use these techniques and a major sin. Why its a curse is extremely interesting, but a thread for another time.

At any rate, a "Mazal" is a sign state or faith of what is to come. Like a bad mazal may be a black cat for non-jews (this type of thing (black cats arent a mazal though)). Usually a mazal is associated with planets and their alignments, like how zodiacs get their weekly fortune in news-papers.


So if we are above any mazal, then why do we say "mazal tov" to other jews? If we are above a mazal, then how can you say the person has a good mazal?