The Beloved Lord Only Wants to Build Infrastructure

After transmigrating to another world with a compendium of alien creatures, Sergius became the old king's most beloved youngest son and was given a city of his own. But before he could enjoy it, the old king passed away. Because of his black hair, Sergius was branded an ill omen and swiftly sent to a fief far from the royal capital. Looking at the desolate, remote city of Boluo and its people plagued by sickness and hunger, the gardening blood in Sergius's veins burst into flame. Not enough people, and no way to fend off bandits? I've got R-rank Skeletons and SR-rank Man-Eating Plants! Barren land where crops can't survive? I've got all kinds of plant cards, all-rounders that can feed you, fight, and look pretty! As a city lord, having no followers is just embarrassing! I've got... A man stood in front of Sergius with a dark expression, blocking the fervent followers. I'm the only SSR card. Having me is all you need! Several months after Sergius left the royal capital for his fief, the nobles who had been living it up there finally remembered the prince, whose beauty was astounding and whose fate was tragic. They sent an envoy, expecting to receive an obituary announcing Sergius's death in that cursed city. But after being sent to Boluo, the envoy returned as Sergius's fervent believer. He said: Boluo has fearless skeleton guards who slay any enemy that dares offend their lord. Boluo has crops that ripen all year round, so its people will never die of hunger again. The garden of Boluo's lord grows the flowers most beloved by the Creator God, shielding the entire city from misfortune and suffering. A black giant serpent, described in the annals of the Creator God, follows the lord of Boluo. [He is the incarnation of a demon, the practitioner of darkness, the beginning of all slaughter.] [He is also the beloved of the gods, the incarnation of the God of Abundance. The entire continent willingly bows before him, forever basking in his radiance.] 1. An original Western fantasy setting with farming and city-building. No need to worry about historical accuracy. 2. The card-draw rewards are inspired by Plants vs. Zombies, with some modifications. 3. The pairing is with the black serpent. Theme: Build society and improve people's lives