Database: card_games
Question: What is percentage of the cards with a converted Mana Cost of 10 in set of Abyssal Horror?
SQL: SELECT CAST(SUM(CASE WHEN T1.convertedManaCost = 10 THEN 1 ELSE 0 END) AS REAL) * 100 / COUNT(T1.id), T1.name FROM cards AS T1 INNER JOIN sets AS T2 ON T2.code = T1.setCode WHERE T1.name = 'Abyssal Horror'