if enemy team have got so much stun change guardian angel with warmog if you are wining change it with frozen malet , if you dont want use statikk shıv change it with Black cleaver (for armored enemies ) or trinity , if enemy have got so much ad dont change guardian angle with frozen malet or warmog , change it with sunfire , if you need / prefer aoe dmg change bloodthirster with ravenous hydra . never stick to a build ,build according to opponent

pros :

good sustain

good pusher

if you cant get kills in early game you can still be useful in late

cons

Requires a lot of farm to be really effective Late game

low hp pool

low mana pool

use this row

you have got realy good q for counter jungling so try steal enemys bulue and red

bulue golem / red lizard spawn at 1: 55 and spawn again after 5 min so if you want steal enemys buff go at 6 :55 , 11:55,16:55 ( example)

use your q aginst skill shots with good timing you can miss them

dont take risk wait for ganks buy ward

never play aggressive maybe you can get kills but if you trade 1 kill - 1 kill your team mates can be outplayed in late game

new Master Yi s w is not so useful now not give you armor just use it for sustain in lane

in new patch master yi lose his q s ap ratio D: