Sinister Unrest was a card pack campaign that originally lasted from 8:00 PM (PST) on November 19 to 11:00 PM (PST) on November 26, 2012. It was later extended until November 27, 2012 at 1:00 am (PST). It was available as a support card pack for Out the Blue event.
The pack included three new Ultra Rare and six new Rare cards. The new Ultra Rare, (Lady War) Penthesilea the Valiant, was added on November 23 as a part of this card pack.
All the cards in the pack, except (Lady War) Penthesilea the Valiant, continued to be circulated in the existing Legend Cards Pack.