Does anyone remember the title of the novel where the MC draws energy cards and makes a living with that? It was a transmigration novel, and the MC begins to draw pokemon cards, which are super OP. (And I think the MC ended up dating a marshal or a general.)
I think this might be what you're looking for It fits all the criteria but i have to mention that it is bl. It's called 'The Young General's Wife is Mr. Lucky'
Divine Card Creator This could be your Novel, with the Former owner of MC's Body dying of overworking, to impress his Genius older Sister who visited him.