The Houston Rockets agreed to trade Trevor Ariza and the 16th pick in Wednesday night's NBA draft to the Detroit Pistons for a future first-round pick, according to a person with knowledge of the deal. The person spoke on condition of anonymity because the trade had not been announced. The Philadelphia 76ers sent Al Horford and a protected future first-round pick to Oklahoma City, and the Minnesota Timberwolves reacquired point guard Ricky Rubio in a separate trade with the Thunder. The person confirmed the deal to The Associated Press on condition of anonymity because the trade had not yet been announced. The Timberwolves obtained the 17th pick, which originally belonged to Brooklyn, from Atlanta in a four-team, 12-player, three-pick trade in February.