What kind of object type is WP_Query?

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I’m not sure you understand the logic of WP_Query. Rather than explain in words, here’s a code example;

$query = new WP_Query( array( 'meta_key' => 'Old ID', 'meta_value' => $atts['oldid'] ) );
if ( $query->have_posts() )
    return $query->posts[0]->post_title;

return '';

Check out the codex on interacting with WP_Query.

UPDATE: To use the query as you would normally, i.e. The Loop;

<?php if ( $query->have_posts() ) : ?>

    <?php while ( $query->have_posts() ) : $query->the_post(); ?>

        <a href="https://wordpress.stackexchange.com/questions/16600/<?php the_permalink(); ?>"><?php the_title(); ?></a>

    <?php endwhile; ?>

<?php endif; ?>
<?php wp_reset_postdata(); ?>

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