This version has more lethality than commonly seen lists through 2x Fury and Felsteel Executioner. Having a 1-drop that can get in some chip damage or value trade feels much smoother than just playing a weapon turn 1, that's why I like the 2x Worgen Infiltrator instead of Trueaim Crescent.
The Wailing Caverns brought us Devouring Ectoplasm, which fits perfectly in Deathrattle DH. I would love to include Illidari Studies to smooth out the curve, but it's hard to decide what to cut. Maybe the Felsteel Executioners have to go.
Edit: removed Felsteel Executioner for Felrattler, removed Sneaky Delinquent for Sigil of Summoning, removed Worgen Infiltrator for Meeting Stone, included Illidari Studies and Ace Hunter Kreen for Death's Head Cultist.