1:43 Diecast Model Mattel Elite Series Lamborghini Reventon. Lamborghini Reventón (pronounced: reh-bent-ohn) is a mid-engined sports car that debuted at the 2007 Frankfurt Auto Show. It is currently the most powerful and expensive Lamborghini road car to date, costing one million euro. The official press release states that only 20 of the full size car will be built, plus one additional example for the Lamborghini Museum.