When I got my set of DC Universe Classics wave 7 (carded | loose), it came with the Big Barda variant. I dig chicks in helmets who could break me in half, so I picked up the regular version. My DCUC7 set also included modern Booster Gold, who comes with a Skeet who flips open to reveal Mr. Mind. That prompted me to pick up a DCD Dr. Sivana, who also comes with Mr. Mind as an accessory.
Compared to figures in DCUC, Sivana has more limited articulation, making it impossible to pose him standing straight up – with no ankle articulation you can’t really keep him standing except when his legs are in a wide front to back stance. In that pose, he is a bit shorter than the DCUC Captain Marvel, but maybe still a little too tall for DCUC scale.