What makes a good teacher?

 
We all watch Youtube videos and other lessons by professional art teachers nowadays. But what makes a teacher a GOOD teacher? In my opinion, a good teacher makes you want to fetch your pencil and paints after a few minutes while watching the video. For me, Toni Burt is a master doing this - I´m not able to watch one of her videos without grabbing my pencil and watercolours and follow her instructions. I especially love that my results always look like my own designs and not hers. I´d call this a teacher´s super power.