Start by Making Golden Fingers

When others were reborn, the protagonist got the golden finger, but I actually acted as the golden finger for others. Fortunately, as a "middleman", I can make a profit, so the evil protagonist will work for me honestly. This is a story about a time traveler who became Goldfinger and had to exploit various protagonists and time travelers in order to become the strongest. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.