It's up to you, to play Praxie in every deck you build but If you ask for a rating and he's bad in the deck (and in this deck (and in every other T2 deck where you splash him) he is bad) I will rate it red.
Praxie and Chan don't belong in this deck, they are both good T1 cards but this is a T2 deck and rating should be on the decks powerlevel and not on the decks powerlevel compared to your collection.
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.