i hit master this season like 10 times and this is the build i used every single time.

HERES SOME TIPS WITH THE BUILD:
1. PLAY FOR XP. try to get as much XP as possible especially in mid game. you are squishy with this build if you fall behind in lvls, so try to min max xp gain by either taking solo xp or shadowing one of your teammates(dont shadow your pre lvl 6 kassadin XD). you dont play to roam with this build(you can roam mid if the situation calls but avoid going top, its a waste of time). roam only for objectives/invades. if im walking out of base and there's 3 waves crashing bot and noones there to take it but a fight is happening in mid, i'd still go bot just to get the xp (gold is the cherry on top).
2. be selfish, dont give every kill to adc in early game. take some of them especially if you are lacking gold for pickaxe/cyclos (pickaxe for brutlizer item>cyclos).
3. if you are lacking gold for an item(cyclos/opportunity.. anything that gives you huge spike) take a few cs and ignore your team pings. just ping your item and its all good.
4. you have the strongest mid game out of every other pyke build if you did everything correctly.id even say, it makes pyke more of a mid game champ rather than an early game champ.however your tempo isnt as good as something like ghostblade rush with relentless(your roaming capability is lower but 1v9 potential way higher).
this is why its a low elo build, you have so much dmg with the build you dont need your allies to have brain and deal dmg .
5. into some matchups because you dont have unflinching bone plating , you'll be forced to play safer early game(ex. rell braum lucian). however you can take the other rune if you wish so.
6. enjoy one shotting.