He does offer the additional upside of an ultimate that can devastate your opponents' boards and beef up your own presence, which probably explains why the planeswalker is the more played commander
Its still an awful topdeck, but it at least does something even if your opponent has nothing to take, and it could be a big player in U/B proliferate
Pacifism itself is bad because it is fairly easy to remove and does nothing to stop abilities and static effects
2 Mercy Killing Green isnt typically the color known for destroying creatures, but Mercy Killing is a targeted removal spell that gets around even indestructible
Well Rested Well Rested is a fantastic Aura since you are often always going to have Wolverine tapped one way or another
Of course, two-cost Jafar is important to this deck for more reasons than just its ability to counter Evasive characters its what you are going to use to shift into Jafar another stronger Jafar