5 Ultron, Artificial Malevolence Fittingly, Marvels big bad robot is an excellent artifact Commander or even a great inclusion in the 99 of any artifact-focused Commander deck, regardless of color
There are plenty of other payoffs for Jorn, even if he ends up dying in combat, and Vivien, Monsters Advocate, is a great one
With Commander, there are more opportunities to put more expensive cards into your deck that you might not play with otherwise
You can look at the top card of your deck at any time, which is nice, but you can also play lands from the top of your library, which is even nicer
Or you could pair it with some sacrifice or removal to get the ball rolling
The awkward ink cost of Merlin and Madam Mim cards means that you might be better off playing them off-curve and instead focusing on building a board of strong bodies early on