What you'll need :
1 deck ( cataclysm one prefered)
What to do :
Return the quest
Get trinket - Do not use resell or anything -
Find someone to trade the trinket for the deck
e.g you have Darkmoon Card: Tsunami - Item - World of Warcraft find someone to exchange this for Tsunami Deck - Item - World of Warcraft
Repeat till exilted , the last trinket you get you can sell it , in some cases you might sell it even higher than you bought it first time.
tip: best time to trade a trinket for a deck is when there isn't a darkmoon faire available.