The  Beserker Rage & Grim Procession decks are now available for Duels of the Planeswalkers 2013. For $2.99 you get both decks.

From Wizards:

Berserker Rage: Surge to victory with the red and green “Berserker Rage” deck. Summon formidable monsters, and when opponents let their guard down, use might magic to double their size!

Grim Procession: The end is nigh! Wield the spirits, shades, and life-sapping magic in the white and black “Grim Procession” deck to show opponents that their defeat is inevitable.

The deck pack is available for the game on all supported platforms (Xbox LIVE Arcade, PlayStation Network, Steam and iPad.) Starting on December 12th, you’ll be able to purchase the decks individually.