Database: card_games (difficulty: simple)
Question: Did the set of cards with "Celestial Messenger" appear on Magic: The Gathering Online?
SQL: SELECT IIF(T2.mtgoCode IS NOT NULL, 'YES', 'NO') FROM cards AS T1 INNER JOIN sets AS T2 ON T2.code = T1.setCode WHERE T1.name = 'Celestial Messenger'