SELECT COUNT("Directed by") FROM table_29683 WHERE "Title" = 'Magic Unmasked'
how many directors had the episode called 'magic unmasked'?
CREATE TABLE table_29683 (
    "No. in series" real,
    "No. in season" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "U.S. viewers (millions)" text,
    "Original U.S. air date" text,
    "Prod. code" text
)