While their addition to Constructed has been met with a great deal of success, Death Knight Hero cards have cause some significant problems for Arena. In a game mode with very limited answers and combos, having to deal with a permanently upgraded Hero Power proved to be nigh impossible, especially when you're faced off against some of the most powerful Death Knight cards like Frost Lich Jaina.

As such, I am very happy to announce that Blizzard will be removing all nine Knights of the Frozen Throne Death Knight Hero cards from the Arena pool this Tuesday, November 14th. Naturally, this won't affect already existing decks, so if you don't feel like fighting a swarm of Death Knights at the high win bracket you might want to wait a week or two for all of the current decks to clear out.

It is worth mentioning, however, that the Death Knight Hero cards can still be acquired in-game via the Discover mechanic, or just through pure chance on certain random effects. While these sort of events will occasionally lead to lopsided matches, it shouldn't be too much of a problem in the long run as Hearthstone already has plenty of ridiculous random effects that can dictate the course of a game, and this goes doubly so for Arena.

As a final note, you can check out all of the currently banned cards and altered Arena rules by heading over to the Hearthstone Forums.