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#3. Bloodreaver Gul'dan
Expansion: Knights of the Frozen Throne
Bloodreaver Gul'dan is possibly the strongest Death Knight Hero Card, contested with Jaina and Rexxar. Even though it is 10 mana, the Battlecry can help you resurrect strong Demons such as Voidlord, Doomguard and flood your board with Demons.
The Hero Power of Bloodreaver Gul'dan is also very strong, compensating for the useless Hero Power of Warlocks during the Fatigue stage. At some point, you don't need to draw too much and gaining 3 life and dealing damage comes in handy.
#2. Voidlord
Expansion: Kobolds & Catacombs
Voidlord, often called Void Daddy, is an extremely powerful Taunt for the Warlock class. At 9 health and the Deathrattle summoning 9 more health, it is incredibly tough to penetrate unless you Silence the minion. Voidlord can be summoned from Bane of Doom or cheated out with Skull of the Manari on an earlier turn since it is a Demon.
Voidlord is similar to Priest's Obsidian Statue, both powerful 9-drop taunts and Epics.
