Greasefang, Okiba Boss cares about having vehicles in your graveyard, which makes me think of a porte-manteau of motor pool and cesspool. I like the theming here: You cast your vehicles, they exist on the battlefield, they die in combat, Greasefang brings them back, they can come back to your hand if they survive
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So, with many permanents active, you can make Nykthos, Shrine to Nyx generate a huge amount of mana very easily to ramp quickly
Let's look at the stock list: Revival Trance is a focused Graveyard deck: I count 19 cards that put creatures into the graveyard either through milling or discarding and 25 cards that care about your graveyard, mostly reanimation but a bit of other stuff too
This is very useful for coming out ahead in messy combat situations
They are part of the past