Name the card and artist with the most ruling information. Also state if the card is a promotional printing.
with the most ruling information refers to Max(count(rulings.uuid)); the card is the promotional printing refers to isPromo = 1;
SELECT T1.name, T1.artist, T1.isPromo FROM cards AS T1 INNER JOIN rulings AS T2 ON T1.uuid = T2.uuid WHERE T1.isPromo = 1 GROUP BY T1.artist ORDER BY COUNT(DISTINCT T1.uuid) DESC LIMIT 1