Chuck's Reviews Transformers Rise of the Beasts Beast Combiner Optimus Prime and Airazor
 

Leave it to Hasbro to keep the best figures for the end of the line. Optimus Prime and its Beast Combiner partner Lionblade are awesome, this is the best set of the line. Prime features great articulation, something the other Beast Combiners lacked. Lionblade is an obvious homage to Lio Convoy or Lio Prime; depending on where you're from. Airazor is a triple changer of sorts and is functional for most figures. Hopefully, you'll be able to find these figures if you are interested.

http://www.youtube.com/watch?v=NJgZGbmlLTA