These cards can be replaced with Armorsmith, Lord of the Arena, Fight Trainer. The replacement takes place from left to right (i.e., if the player replaced one card, he will receive Armorsmith regardless of whether Outrider's Axe or Conditioning (Rank 1) was replaced).
The player always draws the first cards in next order:
Thrall was found amongst the bloody bodies of his murdered parents somewhere in the north of Loch Modan by Aedelas Blackmoore, commander of the internment camps which held orcs after the end of the Second War. Blackmoore gave him the name Thrall, which was another word for "slave" in the human tongue, which would cling to the orc for the remainder of his life. Blackmoore returned to his fortress, Durnholde Keep, with Thrall, and raised him as a gladiator — with all the savagery of an orc, but with the keen strategic intellect of a human. He was trained and taught by many, wet-nursed by a human woman, and grew to befriend her daughter, Taretha Foxton. Thrall proved to be an excellent student and a phenomenal fighter. Thrall became a gladiator in Durnholde's arena and Aedelas' source of money. During one encounter in the arena, Prince Arthas Menethil visited Durnholde Keep in order to watch Thrall in a fight.
He was clever, quick and enormous even by orc standards. Blackmoore's abusive beatings both in and out of the ring began to take its toll. Taretha began to write him letters and secretly delivered them to him in his cage within books, and he wrote back to her. Eventually, he wrote to Taretha that he wished to escape, following a series of fights where he fought bravely but did not finish the last round, and was consequently physically punished by Aedelas.
Taretha created a diversion inside Durnholde Keep which allowed Thrall to escape from his cell unnoticed. They met up outside the fortress by a cave, and Taretha gave him provisions and supplies. He then left Durnholde, hoping to never return.