If you are playing a graveyard deck all about throwing your own library into the great beyond, you can get this great behemoth out on the field in just a handful of turns
Zombies are an always-popular archetype across various builds, and especially in Commander
This set can help start them out with a card portfolio, collector's guide, four booster packs from Fabled , and a promo card
Pay seven mana for Rot Hulk (or you know, cheat him out, that's always preferable) and you'll have 5/5 Zombie with menace whose enter the battlefield effect rewards you with a reanimated zombie for each opponent you have
I feel Nahiri would have been playable as a three-mana spell, even if you had to reduce her loyalty to justify it
If you want to play a deck that will keep your opponent guessing, Ninjas are the way to go