block-editor-disable-blocks.php

<?php

add_filter( 'sixtenpressblockeditor_disable_blocks', 'leaven_disallowed_blocks' );
/**
 * Define the blocks we are disallowing.
 *
 * @return array
 */
function leaven_disallowed_blocks( $blocks ) {
	return array_merge( 
		$blocks,
		array(
			'core/verse',
			'core-embed/animoto',
			'core-embed/cloudup',
			'core-embed/collegehumor',
			'core-embed/crowdsignal',
			'core-embed/dailymotion',
			'core-embed/funnyordie',
			'core-embed/hulu',
			'core-embed/imgur',
			'core-embed/issuu',
			'core-embed/kickstarter',
			'core-embed/meetup-com',
			'core-embed/mixcloud',
			'core-embed/reverbnation',
			'core-embed/screencast',
			'core-embed/scribd',
			'core-embed/slideshare',
			'core-embed/smugmug',
			'core-embed/ted',
			'core-embed/tumblr',
			'core-embed/videopress',
			'core-embed/wordpress-tv',
		)
	);
}