Blanket of Night does the same thing as Urborg, Tomb of Yawgmoth but since its an enchantment its a little more vulnerable to interaction, but I like having the redundancy
Quite big but far from enough to win with on its own
The part that intrigues me the most is Venturing into the Dungeon, but even that seems a little clunky, though it is obviously a late game mana sink
Fatal Push was a bridge between the two in many ways, as it was able to be played on turn one or two, while also being able to handle bigger creatures most notably Tarmogoyf and Thought-Knot Seer at the time
Five is a lot of artifacts, granted, but even in Standard, there are ways to make it happen
This is done by MTG designers to show that the color is corporatist and selfish, and black is one of the colors where these definitions best apply