A common phrase used by impressed laymen to a good magician is a sheepish "I will never play cards with you".
How does one be be proficient enough in card magic to be credited with such awestruck respect? In essence, a tall building requires a strong foundation and a doctor needs good knowledge about medicine. Thus, an entertaining magician needs to be able to perform his card routines well and without hesitation.
With the Happy Angels @ AWWA