Doomsday Magician Black Dragon Sword's Special Ability: Choose One of Two

A person who has just gained abilities is like a newborn baby, but in the next second he will become a strong man who cannibalize people. The growth of superpowers happens in an instant! The meteorite falling from the sky is the stepping stone of Cthulhu civilization. The stars in the sky are full of powerful energy. With it, you can control your powers, destiny and future. In this year, scientific and technological civilization reached its peak, and experiments brought the final disaster and gift to mankind until the end. The protagonist, Chen Tiannan, was born in the year 200 after the end of the world. When he awakened his powers, he was rarely given a choice of two golden powers. One is a rules magician professional ability that stands at the pinnacle of the mage. A deck of playing cards combines an infinite flow of conceptual skills, which is called Cthulhu's representative ability, and has incomprehensible side effects; the other is the absolute nemesis of the meat warrior, the Supreme Black Dragon Sword, known as the right hand of God. Its absolute output means a relatively pure soul, and it is the sword of light that cuts off all darkness. The two are like two sides of a coin, intelligence and bravery are inseparable. And he eventually joined the Cthulhu Association of Superpowers and became the 1874th otherworldly god on the round throne. From his awakening to his excavation, the entire process was monitored by the ancient association members with supernatural powers, broadcast live in real time, and even caused the observer effect to interfere with him, either fatally, or with divine help! He saw all this in his heart. On the day he returned to the stage of awakening, he felt that heaven was watching him, without him, just because these two golden powers were too heaven-defying...