Waste Not does not really fit in the 8-rack archetype. the 2 black mana is useless since you have to use/discard a card as well; the 2 mana benefit greatly diminishes and becomes useless by turn 5-6. the 2/2 zombie is also very slow because it has summoning sickness and your deck has 0 synergy with a 2/2 black zombie. drawing a card can be nice but you normally are in top-deck mode with them by the time you deploy your rack-effects.

uiuiho12, i say that this is "my take on an 8rack deck"... I can get obliterator out on turn 3 with the , zombies serve as chumps anyway and need no "synergy," drawing a card is great in any deck and by turn 5-6 their hand would be drained anyway so i'd be doing damage with the rack/affliction

Sick deck, have u thought about adding some Bitterblossom to it? I know u have Obliterator but u won't draw him every game even as a 4-of. I'd add some Ensnaring Bridge in anyway. I'd drop a Waste Not for another Lilly or at minimum a Necrogen Mists

Mind Shatter could be worth including as a singleton too.

Urborg is great as a 4 of, Inkmoth Nexus + Runechanter's Pike could also be a quality inclusion. Also 3-4x Dark Confidant would help greatly to keep your hand full. As much as I wish Waste Not could fit, it really doesn't. It's better to run 1 drop enchantments that go direct damage routes. Phyrexian Obliterator is such a house, but I think the Man-Land/Bitterblossom + Pike would be your best hope, that way it opens up the way for more removal like Slaughter Pact or Dismember. Duress could be an excellent inclusion against Storm, or other popular combo/control decks (Sideboard). But, take what you will from these suggestions and let me know what you think about them! Feel free to comment on my decks, and have a nice day!