The Chaos Booster (CS) represents the third tournament legal on-line booster designed and created by the Spellfire community. This expansion adds a variety of new champions (the favorite card type of players) and a handful of new Avatars. Clerics get a strong boost in this expansion as do swimmers. In addition, we see the appearance of a host of potions and oils.
Note that all CHAOS cards are legal for tournament play unless a particular format restricts particular cards. Note also that for purposes of game play CHAOS cards are of "no edition". This is regardless of the card stock you paste them over.
Courtesy of Spellfire.net