I had always envisioned a champion that used gold as a damage dealing mechanic, and originally designed one in the forums. However, the design was haphazard, and thus it was quickly dissolved into the sands of oblivion. However, looking at other champions and taking a closer look at statistics, I think it is time to bring it back once more.
The city of Zaun was always a city open to enterprise, an environment which Pecuniastus chose to take advantage of. If there was any lessons to be learned from History, Pecuniastus certainly learned that drug make profit. Pecuniastus took to the route of drugs, and it was he that created the myth that Shimmer granted the users new abilities. Despite the shady nature of his business, the Council of Zaun simply did not care for his business, especially as it helped alleviate pollution produced by techmaturgy works.
However, Pecuniastus had to continue to propagate the idea that Shimmer was a good thing to use. This notion was challenged by a few people, most bribed out by Pecuniastus. However, one threat that refused to bow to money came from Basilis Pontia, who returned to Zaun to spread the word of life-saving steel, urging people to reject drugs that affect the flesh in favor of steel to replace the flesh. Fortunately for Pecuniastus, distrust of Basilis's gospel by others, including the head of the College of Techmaturgy Professor Stanwick, had driven Basilis out of Zaun, although ill-informed parents of Shimmer addicts started to look towards alternatives, breaking free of Pecuniastus's propaganda slowly but surely, even if the said parents rejected Basilis's original ideas.
With profits starting to decline, Pecuniastus grew anxious, especially as other cities such as Piltover grew more aware of the Shimmer substance thanks to Basilis's preaching, which immediately resulted in cities seizing Shimmer stocks. Growing desperate, Pecuniastus used his money to invest in weapon market: Why make such a decision, especially when League of Legends pretty much reduced the importance of war, and thus the profitability of the market? Pecuniastus was soon to be found in the League to do one thing: He will be the advertisement for Shimmer. He has done it all in the name of profit.