Sales data for high-value cards can be stale
Sure, Daretti and Chandra are around $17-$20, but the rest fall under that price
You want a 3-color mana base since there are some good cards in Simic
I think where it becomes the most dangerous is when a card is creating a huge blast of Treasures that come into play untapped. "I could definitely see a world in the future where we try and make the big blasts of Treasure come in tapped." Most experienced Commander players probably wont be surprised to hear Verheys example of this: Dockside Extortionist , a creature from Commander 2019 that can produce boatloads of Treasure, poetically blasting its own price on the secondary market to more than $60USD at time of writing
So while black has some really stellar reanimation including the eponymous Reanimate there are just so many decent options, that none can really be claimed to be essential
Overlord of Hauntwoods, Floodpits, and Boilerbilges are valuable for their abilities in-game and unique designs