Searching for a reason to buy collectors' editions of Mattel products? With the toy drops unveiled during Mattel Creations Revealed event Thursday, you may be able to make a case for yourself. Homing in on fandoms ranging from anime to Barbie to Monster High, the company shared a fresh lineup of releases. Masters of the Universe fans: lock in. You can stack Mattel Bricks to create Eternia's legendary Castle Grayskull with a new set (pictured above) that's the first of its kind for the toy giant. Get into your display -- or play -- with Masters of the Universe Nano figures depicting characters like He-Man, Evil-Lyn, Skeletor, Battle Cat and Teela. Available in the Brick Shop starting April 25, the set will retail for $65. For fans who want a bit of extra nostalgia, you can also buy the light-up Laser Power He-Man figure for $30 to add to your display.…