If you want your brought cards to go to your deck, tick the box next to "Automatically add the cards I purchase in the Market to my deck." (Its located under "The Market allows players to buy and sell characters between them. To sell your characters, use the link available below each of your characters in My Collection. To improve your collection with additional packs of characters, just go to The Shop."
The Urban Rivals team is made by lovers of all kind of Collectibles Cards Games and Trading Cards Games like: Magic the Gathering, Dominion, Vampire, Yu-Gi-Oh!, Pokemon, Wakfu TCG, Assassin Creed Recollection, Shadow Era, Kard Kombat and Might & Magic Duel of Champions.