Terrarion
In the last segment of his artifact extravaganza, Carlos is looking at Dark Ascension and Kataki, War’s Wage. This guy has typically been considered unplayable for Commander; but when you build around his effect, he can be pretty nasty.
Pauper is the best format that you’re probably not playing. A healthy Eternal format with some of the coolest decks you’ll find? And it costs a fraction of any other Constructed format you can find!