Get all post from custom post type in custom taxonomy

i think you posted the different code earlier. But if this is the code you are using right now then you should so this

$slide = new wp_query( array ( 'post_type' => 'banner' ,
                                'tax_query' =>
                                          array(
                                            array(
                                              'taxonomy' => 'country', 
                                              'field'    => 'name',
                                              'terms'    => 'algeria'
                                            ),
                                          ),                               
                               'meta_query' => array( 
                                                    'relation' => 'AND',                                                                        
                                                    array('key' => 'page_ads','value' => 'home'),
                                                     array('key' => 'position_ads','value' => 'top')
                                                     )
                            ));