Hey, Carry! Where's Your Skill Cooldown?

[Multiple heroines + soul transmigration + infinite-flow + instance worlds + slow burn] “Your name is Lu Jin.” A note lay quietly on the table. A famous magician from another world is forced to take over a magic show that is about to begin. Will he win? “Of course! I’m the greatest magician there is!” Full of confidence, he met an untimely end. Unexpectedly, at the moment of his death, he sensed an unknown summons and was granted a second life. He could continue his journey, this time traveling through various instance worlds. And so, he met all kinds of people. A certain heiress: “Please, please, take me with you!” A certain older vampire: “Heh heh heh, little one, your blood smells quite delicious~” A white-haired witch: “That’s strange. Why are your spells different from mine?” I’m no good at writing introductions, so just come read the story.