I Rely on the Trading System to Turn the Waste Spiritual Roots into an Immortal King

Others rely on talent to cultivate immortality, but I rely entirely on "buying" to cultivate immortality. An ordinary first-grade spiritual root? Buy a Fusion Spirit Pill and become a fifth-grade mortal! Practicing too slowly? Buy a copy of "The Breathing Method of the Heavens" and take off straight away! No magic weapon? Buy a magic weapon from a big guy from another world! The geniuses of the Qin family are still fighting for the family's few resources. I am already considering whether to get the golden elixir first, or directly trade for the body of the Immortal King. Later, the whole world of immortality spread: Don't mess with Qin Feng, that guy's backstage... Is the entire world.