user: Question: Who is the designer of the Christmas: Winter Fun (USA) stamp?
Columns: ['Date of Issue', 'Theme', 'Denomination', 'Design', 'Illustration', 'Printing Process', 'Paper Type', 'First Day Cover Cancellation']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['15 January 2008', 'Celebration', 'Permanent', 'Michael Zavacky, McMillan', 'Michael Zavacky, McMillan', 'Lithography in 7 colours', 'Lowe-Martin', 'Zeballos, BC']
SQL:

assistant: SELECT "Design" FROM "Table" WHERE "Theme" = 'Christmas: Winter Fun (USA)';