How many cards in the set Coldsnap have a black border color?
card set Coldsnap refers to name = 'Coldsnap'; black border color refers to borderColor = 'black'
SELECT SUM(CASE WHEN T1.borderColor = 'black' THEN 1 ELSE 0 END) FROM cards AS T1 INNER JOIN sets AS T2 ON T2.code = T1.setCode WHERE T2.name = 'Coldsnap'