Dr. Satan vs. Black Magic(1968)

Original title: Dr. Satán y la magia negra

Plutarco Satan returns, this time he's pitted against a rival evil organization intent on owning the very formula rumored to turn any metal into gold! Dr. Satan must go toe to toe with the vampiric black magician Yei Lin, in order to keep it out of their hands. The cost of failure? His eternal rest!