How many people rated 5 for the podcast which title contains the word 'spoiler' under the 'art' category '?
rated 5 refers to rating = 5; contain the word 'spoilers' refers to title like '%spoilers%'; 'art' is the category name;
SELECT COUNT(T3.podcast_id) FROM categories AS T1 INNER JOIN podcasts AS T2 ON T2.podcast_id = T1.podcast_id INNER JOIN reviews AS T3 ON T3.podcast_id = T2.podcast_id WHERE T2.title LIKE '%spoilers%' AND T1.category = 'arts' AND T3.rating = 5