Beast Tamer: I can extract blood

“Hey, this chicken actually has a trace of Fire Dragon bloodline. Great, I’ll buy 100,000 of them and make a Fire Dragon to play with.”

“Wow, this rabbit actually has Moon Rabbit bloodline. I’ll buy 100,000 of them and make a Moon Rabbit.”

This is a story about a time traveler who, in the world of cultivating immortals, relies on a golden finger that can extract bloodlines to continuously create mythical beasts.