I Started a One-On-One Challenge with a Big Card, and I Started a Fantasy Life

Su Yuansan thought, After black runes suddenly appear on his body one day, he will start a counterattack life like the protagonist of the novel. However, "Oh my god, what kind of hell is it to start a one-on-one battle with a big card!" The weird demon flower, the terrifying beast king, the mechanical girl full of cyberpunk feeling... A new fantasy world begins.