Showing wordpress latest post thumbnails in slider with auto increment

You can achieve this by developing custom code like following. You can find more information about WP_Query here https://codex.wordpress.org/Class_Reference/WP_Query

<?php
$args = array( 'posts_per_page' => 100, 'meta_key' => '_thumbnail_id', 'ignore_sticky_posts' => 1 );

// The Query
$the_query = new WP_Query( $args );

// The Loop
if ( $the_query->have_posts() ) {

    while ( $the_query->have_posts() ) {
        $the_query->the_post();

        if ( has_post_thumbnail() ) { ?>
            <figure <?php if ( $the_query->current_post == 0 && ! is_paged() ){ echo 'class="show"';  } ?> >
                <img src="https://wordpress.stackexchange.com/questions/267337/<?php the_post_thumbnail_url(); ?>" />
            </figure>
        <?php }
    }

    /* Restore original Post Data */
    wp_reset_postdata();
}
?>