Realised I needed a "haste outlet" creature in my grave to get off the Necrotic Ooze combo.

Havengul Lich -> Thornling

Considering replacing Extractor Demon with Rotting Rats or Geralf's Masterpiece. The Demon is good when I hard-cast it for filling up the graveyard slowly, but rarely do I ever resort to that. And when it is in the grave, rarely will I revive it just for some extra value milling.

Rotting Rats and Geralf's Masterpiece are useful in getting combo pieces out of my hand into the graveyard after I've milled my library. They also help with flashing-back Dread Return. Rotting Rats is less mana intensive but only gets one card out of my hand, while Geralf's Masterpiece gets three, I doubt I'll be trying to combo off with three key cards still in my hand. The body on Geralf's Masterpiece is pretty irrelevant, while Rotting Rats ability could damage opponents while helping me.

I could also keep Extractor Demon and cut something else for Rotting Rats.