This is a table top collectible card game and has no connection to the World of Warcraft MMORPG other than the name of the game and the theme. This is not a sale of any of Blizzard Entertainment's intellectual property associated with the Video Game. To be clear, no in game property for the World of Warcraft is being sold.

Text: As an additional cost to play, destroy any number of cards you control. You pay (5) less to play Deathwing for each card destroyed this way.

Assault 5:

At the start of your turn, target opponent destroys two cards he controls.