Hearthpwn

Quick run down of my choice of cards:

Soulfire - removal/execute
Mortal Coil - removal/card draw
Voidwalker - [Edit] Removed for Blood Knight after running into a lot of Argent Squires and Scarlet Crusaders + extra Sunwalker for late-game protection. 
Ancient Watcher - Nice early-game combos with Sunfury/Ironbeak and good mid-game removal with shadowflame
Nerubian Egg - Strong early game control with Sunfury and decent mid to late game with Baron Geddon/Dark Iron
Harvest Golem - Solid turn 3 play, hard to remove
Void Terror - Proc's Nerubian Egg death rattle for a turn 3 Tazdingo minus the taunt - good fodder for eating useless early game ancient watchers.
Shadowflame - mid-game removal
Hellfire - Again, good mid-game removal - minus the destruction of a minion + hero damage.
Tazdingo - Good mid-game taunt, generally trades 2 for 1
Azure Drake - Card Draw and spell power for Soul Fires/Mortal Coils e.t.c - preferably not used with Hellfire unless destroying your own Azure Drake is fine. 
Stampeding Kodo - good removal for pesky creatures like Abusive, Leper Gnomes, Argent Squires and their 2 or below kin
Siphon Soul - Good late-game removal and minor health restore with things such as Doomguard with zoo or anything else in other decks
Sunwalker - V.good late game taunt, trades again 2 for 1 in the late game
Hogger - [Edit] Removed for Bloodmage Thalnos - brilliant for all spells. 
Baron Geddon - V.good removal, good for proccing your own Nerubian eggs and general board clear. 
Lord Jaraxxus - Alexstrasza on speed, potential health restore in the late game, gives a 3/8 weapon on played turn for removal/finishing blows e.t.c consistent summoning of 6/6's beyond. Potentially a win-more card.