This is Reynad’s Warlock Aggro Deck, that he named Zoo.

Updates:
(3/5/14): Reynad has swapped a few cards around. He dropped both of
the Argent Commander and Young Priestess, in favor of two Dark Iron
Dwarf and two Abusive Sergeant.

Soulfire × 2
Flame Imp × 2
Mortal Coil × 2
Voidwalker × 2
Doomguard × 2

Abusive Sergeant × 2
Argent Squire × 2
Shieldbearer × 2
Dire Wolf Alpha × 2
Knife Juggler × 2
Harvest Golem × 2
Scarlet Crusader × 2
Shattered Sun Cleric × 2
Dark Iron Dwarf × 2
Defender of Argus × 2