The dramatic colours and Plasma-themed artwork gave it a futuristic, almost electric energy
While it only draws the turn it enters, that was always the true mode of Deep Hours
The deck then adds a ton of different wrath effects (Star of Extinction, Razia, Austere Command, Blasphemous Act, Day of Judgment, etc) to deal with any threats your opponents might be able to cast prior to you repeatedly wiping the board of lands
Along with the staple black removal suite, Dreadknight gives us a rock-solid foundation that happily soaks up opposing removal and small creatures while you build to bigger things
Flashing this in on someones end step is actually a really satisfying reflection of how this mechanic would work in a pinch, and you know I love when flavor meets function