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For Third Party it's probably Dreamstar Silverbolt. Massive shellformer that needs tons of panels to line up perfectly and in the right order. Black Apple Optimus Prime is a close second, being a significantly more complex version of MPM4. The gas tanks can turn into his guns but they are just a mass of joints and hinges and are basically impossible to transform without a video guide. Both toys look great but you really have to set an afternoon aside to transform them.