The puzzle's title "Domino" is quite misleading.
The prompt here reads "Close your eyes, look first to the skies."
From this, one can suppose that the cards held up by the magician in the puzzle each represent a letter in Braille, spelling:
The skywriting  which corresponds to this puzzle is another series of (somewhat hard-to-read) Braille letters which reads:
The answer is: DRAWING A BLANK
To next puzzle: Magic Lesson.