Xin is already an OP champion.So you dont have to buy so many ad items.İf you dont have an opponent that counters your Q skill its okay.Rely on your Q skill and buy Frozen Heart to get a fine cooldown and armor.İf you have an enemy like teemo start with Maw of Malmortius.That will be enough with mercury's treads.Do your combos as Q-W-E to start your combo immediately.Because of your passive even hard tanks will have bad time against you.Start teamfights with attacking with Q-E-R to take out an enemy, make others fly and fight 5 against 4.İf you buy enchantment furor you have more chance to survive after starting teamfights.