And when you bring the heat, you can tap some hybrid mana (which doesn't include red) and bring back a smaller creature that is going to come out for another frolic in the hay
From mill effects (Ashiok), to a number of creature summon effects, there are a large number of highly variable win conditions
This allows Selfsame Simulacrum to have complex interactions with various cards while also being a simple card to use
They usually do not ramp you
It seems the 41st millennium has lots of Blue and Black, but not much White or Green mana to speak of - fitting for a far future where humans and aliens alike have ruined the galaxy with endless war
In terms of differences, it has the following: The Hexwell Crown has a cost of three Ink, it can be used in Ursulas Inkwell and it only has one ability, Perks of Power