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Have you considered Wild Mongrel? If ever there was an easy way to get Stinkweed into the graveyard, it's that. I think it would also help out your early game and speed the deck up. I feel like you've got a lot of creatures here that only take effect once you hit some prerequisites, but you've got to slow yourself down to get there. (I'd also personally go Delve more than Delirium or Undergrowth, but if those are the mechanics you're excited to play with, that's what to build your deck around.)
Putrid Imp would be glorious in this deck, too. Cards like that and Mongrel would also open you up to Grave Scrabbler. There's also cycling stuff like Street Wraith and Unearth, which is an additional way to get back your Stinkweed or Shambling Shell and fits the Sorcery slot nicely for Delirium.