How to write a condition in nginx to change everyone to https all but one host?

Question

Nginx

On server 1, a virtual host that processes all requests from *.domain.com
for all subdomains has a wilcard certificate, you need to throw everyone on https except for one subdomain
Tried like this but nginx swears

if ( $scheme = "http" ) {
       if ( $host != "subdomen.domain.com" ) {
               rewrite ^/(.*)$   https://$host/$1 permanent;
       }
}