The basic idea is to have a deck of cards (25-35 cards) that act like Pandora's Box every time they are drawn.
The images used for the deck could use the top 5 guilds, top players in each gametype, winners of tournaments etc.
To be able to use the chaos deck you would choose a trade option so it would selected like fulldeck is now. This deck would not be collectible.
*this is where I go off into left field*
We could go one step further. Set up portals avatars to be the same size as TT cards and let the players create their own card of themselves. Depending on player levels and memberships you can select the background color, level frames and display numbers (the stats for the avatar are for display purposes only on portal. The in game numbers of the cards will always be drawn randomly and layered each time they are drawn in a game for each player).