Whenever this minion takes damage, gain +3 Attack.
No Pain, No Gain.
 How to get
Gurubashi Berserker x 2 are automatically included in all players' collections.
This 2/7 minion for 5 mana has a very interesting ability. Since he gains +3 attack every time he takes damage he can become very powerful very quickly. Works extremely well in a warrior deck since you can combo him with Inner Rage, Whirlwind, Rampage and Charge which gives you a 13/8 that can attack right away. Mages can use Fireblast to repeatedly increase his power, while priests can focus on increasing his Health through abilities such as Divine Spirit in order to make him extremely resilient, leaving room for his Attack to reach astounding levels.
Since the Berserker's value lies in increasing its Attack, be aware that this will necessitate the minion becoming 'damaged', allowing for the use of abilities such as Execute. It is also initially vulnerable to Shadow Word: Pain. As a potentially high-power minion, be aware of any abilities your opponent may have to directly remove it from play.
The Gurubashi are a fearsome tribe of jungle trolls who reside in Zul'Gurub, in the Eastern Kingdoms. From wowpedia:
Established long before the Great Sundering, the Gurubashi Empire took its name from the strongest tribe of jungle trolls at the time. The jungle trolls ruled the southern jungles of ancient Kalimdor until the Burning Legion's first invasion, which wrought havoc and devastation throughout the continent and culminated in the Great Sundering.