- This Mould King stacking block set is a must-have for any fan of space, planes, and movies. The set includes the infamous Imperial Star Destroyer Executor, complete with intricate details and a sturdy build. With features like MOC - My Own Creation, this 21072 set is perfect for use in educational settings and is suitable for ages 8 and up. The Build & Design Mosaic Puzzle set is part of the Education product line and guarantees hours of fun for any building toy enthusiast. The set does not disappoint, with its brand new stacking block design and unique character selection. The Type and Theme of the set make it a must-have for any collector or fan of the Star Wars franchise.