So-called material attacks were more harmoniously described as physical attacks in games—the damage was simply off the charts. He was known as the strongest Raikage in history. Unlike the Third Kazekage, who was reputed to be the strongest Kazekage yet died young in his early thirties, the Third Raikage was practically the standard MT of this world. Killing the Third Kazekage might have caused Mingye quite a few problems, since Iron Sand's slowing and weight-increasing effects prevented him from using some of his techniques. But the Third Raikage was different. Mingye had even compared them before: if chakra was not taken into account, the Third Kazekage was unquestionably stronger than the Third Raikage. Unfortunately, the Third Kazekage would never know of that assessment.
(If one only calculated the effects of ninjutsu, the Kazekage's slowing and weight-increasing abilities could wear the Raikage to death. But that depended on whether he could withstand the Raikage's massive chakra reserves. I don't think the Kazekage could outlast a Raikage comparable to a tailed beast. Both were Thirds.)
His thoughts had drifted off topic, though only slightly. He had begun plotting to kill the Raikage three years ago. Afraid that the Third Raikage might not die, Mingye had gone to great lengths to avoid affecting the plot—calculating and probing again and again. Yet the Third Raikage had still surpassed his expectations. Back when he read the manga, the Raikage under Impure World Reincarnation had not displayed even a tenth of his true strength, and later they had simply let him throw out his ultimate move. Mingye truly had no idea what Kabuto had been thinking. Instead of allowing these people to act freely, he had turned them into beings driven by instinct. If it had been him, he might have used better methods of coercion