Collectible Card Game Headquarters

Describe the Bug:
Attempting to start the Magic: The Puzzling challenge causes the game to hang as soon as the challenge begins.

Which card did behave improperly ?
N/A

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
KOT, challenge mode

What exactly should be the correct behavior/interaction ?
It shouldn't hang.

Are any other cards possibly affected by this bug ?

John