Prince Taldaram (3drop) Warlock.

I played this deck from rank 19 to rank 12 (my highest ever, i know, sad). It went through multiple tweeks and i think this has been what has worked best for me.

 

Some of the main plays here, you can use Prince Talderan to copy raza, and brewmaster it back in your hand to get a 0 mana hero power.

 

You can use Prince to copy your summoning portal to flood the board late game.

 

Jaraxxus there for even more demons.

 

Prince Talderan is just overall flexible and you can get a 3/3 taunt deathrattle summon a Spikeridge steed or a 3/3 Tyrion.

 

# 1x (1) Mistress of Mixtures

# 1x (1) Mortal Coil

# 1x (1) Voidwalker

# 1x (2) Bloodmage Thalnos

# 1x (2) Defile

# 1x (2) Doomsayer

# 1x (2) Drain Soul

# 1x (2) Friendly Bartender

# 1x (2) Gnomeferatu

# 1x (2) Golakka Crawler

# 1x (2) Youthful Brewmaster

# 1x (3) Prince Taldaram

# 1x (4) Blastcrystal Potion

# 1x (4) Eater of Secrets

# 1x (4) Hellfire

# 1x (4) Kazakus

# 1x (4) Shadowflame

# 1x (4) Summoning Portal

# 1x (5) Cult Apothecary

# 1x (5) Despicable Dreadlord

# 1x (5) Elise the Trailblazer

# 1x (6) Dread Infernal

# 1x (6) Nerubian Unraveler

# 1x (6) Siphon Soul

# 1x (7) Abyssal Enforcer

# 1x (7) Bonemare

# 1x (8) The Lich King

# 1x (8) Twisting Nether

# 1x (9) Lord Jaraxxus

# 1x (10) Bloodreaver Gul'dan