Mardu has a lot of access to artifact support, making Jan Jansen, Chaos Crafter a fantastic commander choice for Sacrifice decks in Mardu
After all, while sometimes Commander is about optimizing every slot, curving out perfectly, and executing your game plan with ruthless efficiency, other times, it is about winning a game with a pony, his Food, and all the friends he made along the way
Its a good fit in lifegain/life drain decks, zombie typal decks, or even Bloomburrow -inspired bat decks that care about gaining and losing life
If poison-proliferate control takes off, this is a great way to remove creatures while furthering your ultimate win-con simultaneously, and that can make this a somewhat reasonable option but probably only for that kind of deck
Conclusion Any errata or banning of cards is sure to shake up a metagame