This would be a lot of money, but remote MD and MH, you control a gyro spinning in them. and basically control the bakugan.Also, detachable bakugan, like you can have one bakugan that can split into, but it still would be ultra stable, Then, if you have more than one of that bakugan, you can combine them to be custom dual attributes, that would be really cool!
Fixed you buy a MD and a MH laready mede and just controll iot with the remote