These levels are based on your collection of character. For each character you receive points equals to its current level * final level (ie. Lao, lvl 3 (final level is 5) brings you 3 * 5 = 15 points), each character counts only once (if you have spares, only the highest is taken into accounts). You start as novice and need 50 to be a senior, 150pts to be a master, 400 to be a guru, 800 to be an Imperator and 1400 to be a TItan.
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.