climbing as a support (not a rant)

I've been support main for few years, it's the role I enjoy playing the most, both in LoL and MMO's. My goal is to reach Silver this season. I just got promoted to b2, so I'd say it's possible. I just have a few general questions. Is my champion pool decent? I play more champions, but these are the ones I'm confident enough to play in rankeds. Anything you don't really recommend? {{champion:53}} {{champion:201}} {{champion:40}} {{champion:89}} {{champion:25}} {{champion:267}} {{champion:37}} {{champion:16}} Is Morgana only one, who'll counter **Thresh**? He's my most feared support, no matter how hard I try, I usually fail (unless playing Morgana). What do you recommend, when getting autofilled adc? Mage support, or picking utility and hoping my carry won't fail? Should I always ask in lobby, whether the adc is autofill or not, so I can pick accordingly? Any other tips?
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