How can you be a top magician?

Both are acceptable, but you normally say at the top.

There have been many great magicians over the years. Some of the most famous in the 20th century were Harry Houdini, Thurston, Kellar, Dante, Blackstone (Both Father and son), Doug Henning, Lance...

harry houdini is

Toupe or wig

The most growing cables Co. world wide is El Sewedy Electric Co. Egypt They are a large scale cables & electric Manufacturer for the local market & for exporting (Asia ,Middle East,Africa and...