mutant biological system

The biological world is manipulated by a terrible mutation system, and mutant organisms appear one by one, so the era of great biological variation has come. A ten-story wild ox, a giant ant that can swallow elephants... Who is the culprit of the great biological mutation? Xu Qianming, a humble teenager on the earth, by chance, got a system to control mutant creatures, save the world, and finally reached the peak of the universe step by step.