i dunno, how do you judge whether a combo is broken? the strongest 2-card combo in the game is probably apprentice/market square. neither of the sc chamber combos come close to that, so if "broken" is "better than any other combo", it isn't broken. it's still pretty good though, especially sc/mengarie, which now requires no villages at all. i guess it depends what exactly your goal is; if it's to make the card less awful without changing the way it's used (i.e. make it good in the situations where it previously was kinda sorta okay) you won't meet the goal, because you can now do menagerie/sc without any support. if your goal is to make the game more fun, it depends on how fun the combos are... which would require playtesting.
I also see sc being really good in engines with draw but without ways to get rid of the starting estates. previously, it was a terminal gold, which is eh, now it's just a gold, which is nice