Would this deck work? (Casual MTG)?

The deck seems fairly strong, Samurai are very strong, but I do have one or 2 suggestions. Add Sensei's Divining Top, Isochron's Scepter, and Lightning Bolt. These will give you more usability. A couple good creatures to add would be Konda, Eight and a Half Tails, and Isamaru Hound of Konda. Konda is an absolute monster and EaaHT gives your creatures survivability.