For newer art and an artist who isn't as as universally lauded among Magic players, I like the art on Archangel of Thune by James Ryman
Although Overlord of the Mistmoors is a little more niche compared to the other overlord cards, its powerful effect is hard to ignore
Not only is the Power Nine mostly artifacts, but some of the most broken cards I can think of are artifacts: Skullclamp, Umezawa's Jitte, and Smuggler's Copter all demonstrate the power of the card type before I even scratch the surface of fast mana like Mana Crypt and Sol Ring
Meanwhile, Ardent Plea gives you another way to cascade and access to exalted triggers, both of which will be pivotal in the mirror
Since there are more ways to fill your graveyard in that format, and extra redundancy for the Energy reanimator plan in Chthonian Nightmare, you could see it excel there before long