Question

why was the king advised to go to magician?​

Answer 1

$\implies$The king was advised to go to the magicians to look into the future as only magicians can do it.

Answer 2

$\large \mapsto \boxed{ \sf \red{Answer}}$

Some of the wise men thought that to decide the right time to do something, one must look into the future and only magicians were able to do that. So, they advised the king to go to the magicians.