mastery tree: a basic 21-0-9 build, 21 in attack for bonus damage, 0 in defense, 9 in utility for faster health and mana regen + exp + advanced clearity for your team in early game.

skill sequence: lvl ur ulti when u can. take yordle trap first to explore bushes, then 90 caliber net to flee ( remember the knock back! ) and at last piltover peacemaker. In farther game lvl piltover peacemaker first followed by yordle trap and last 90 caliber net.

runes: - attack speed.
- life ( for early game advantage ).
- armor penetration.

items:

berserker greves --> movement and attack speed.
seal --> movement and attack speed.
frozen mallet --> life and damage.
infinity edge or vampiric scepter ( depending on how good u go ) --> damage, critical and lifesteal.
( last whisperer if u play against tanks --> armor penetration )
phantomdancer --> critical, attack speed and movement.
bloodthirster --> lifesteal

game: not a lot to say here, always stay at range because that is your best weapon! If u can fight inside bushes it supports ur passiv with a headshot every 3 shots!