September 27, 2013
Face the Hydra is the first Challenge Deck, released with Theros and introducing the solo-play format.
February 7, 2014
Battle the Horde is a Challenge Deck released alongside Born of the Gods, built to be played against rather than with.
May 2, 2014
Defeat a God is the Challenge Deck released with Journey into Nyx, the final set of the Theros block.