Does the Sharingan Drain Too Much Chakra? My Class Has Infinite Mana

【High Martial + Classes + Monsters + Dungeons + Ruthless】 This world is crawling with evil monsters. And terrifying monster abysses!!! As humanity was forced into retreat... Powerful Awakened Class users appeared across the world!!! Some Class users could control the elements and become Grand Mages! Some became support healers, boosting their teammates’ attributes! Some turned into Paladins, taking the frontline as the team’s main tanks! And others... Su Tong arrived in this High Martial world... Nearly eighteen years ago... And... He also carried a pair of Mangekyo Sharingan with him. But to his dismay... The Mangekyo Sharingan had always remained sealed, completely unusable! That is, until the day he awakened his class in his senior year of high school... Su Tong awakened the one-of-a-kind hidden class, Boundless Spellcaster! He thought he was about to become invincible... But what left Su Tong dumbfounded was... This class came with an infinite mana pool, but no skills to use and no way to learn any skills either!!! Just as Su Tong was giving up hope, a pair of eyes suddenly opened deep within his own... Skill: Copy (Instantly duplicates every skill used by an enemy) Skills: Amaterasu, Tsukuyomi, Kagutsuchi... Looking at the outrageous attributes on his status screen, Su Tong gave a proud, disdainful smile and declared: “If Heaven had never given birth to me, Su Tong, Class users would have languished in darkness for all eternity!” “From this day on, I, Su Tong, will be invincible, ruling supreme throughout the ages!!!”