Because it's 23:30 and I'm tired as fuck.

gistfile1.m

-(NSString *)platformsAsOxfordComma; {
  NSArray * platforms = (NSArray *)self.platforms;
  return [platforms SH_reduceValue:@"".mutableCopy withBlock:^id(NSMutableString * memo, NSString * obj) {
    if(platforms.lastObject == obj) {
      if(platforms.count > 1) [memo appendString:NSLocalizedString(@"AND", nil)]; // Do other languages even work like this? 
      [memo appendString:obj];
    }
    else {
      [memo appendString:obj];
      [memo appendString:@", "];
    }
    return memo;
  }];
}