Untitled

SELECT w.id, p.age, w.coins_needed, w.power 
FROM wands w 
JOIN wands_property p ON (w.code = p.code) 
WHERE p.is_evil = 0 
AND w.coins_needed = 
    (SELECT MIN(coins_needed) FROM wands w1 
    JOIN wands_property p1 ON (w1.code = p1.code) 
    WHERE w1.power = w.power AND p1.age = p.age) 
ORDER BY w.power DESC, p.age DESC