Sephiroth falls more firmly into the "death and taxes" camp than he does card-draw, gaining +1/+1 every time an opponent-controlled creature dies
But what makes them that important
They are also strong at the ramping, and multiple one drop mana makers with no restriction on this break decks and formats, like Birds of Paradise and the Llanowar Elves speeding up Fires of Yayimaya to dominate Standard as a second turn drop
Sauron was become now a sorcerer of dreadful power, master of shadows and of phantoms, foul in wisdom, cruel in strength, misshaping what he touched, twisting what he ruled, lord of werewolves
The big saving grace is that you're running very few lands that enter tapped, and we're playing with a heavy amount of artifacts
I loved the feel of Kamigawa block and I enjoyed the limited aspect of it simply because I played it so very much