Fail masteries and build. "Persevance" on assasin ? and why no "Veteran scars" ???

hextech gunblade+trinity+infinity too bad, better build is Boots+BoTRK+BC+BT+LW+FM Too much ad+hp+ar pen

I also feel like the build is flawed, in the masteries, you are right, but IMO BotrK isn't worth it for zed as a rush since he doesn't focus enough on autoattacking early on to deal damage.I normally get it as a 3rd item when hexdrinker isn't needed.You need to go boots, brutalizer for early game damage,  BT(he has great AD scaling), clever(he benefits from it in mid-late game teamfights when he can apply the stacks to more than one target), BotrK(if you haven't gotten hexdrinker in laning phase), LW and GA or mogs or FM(get frozen mallet if you don't have ruined king, mogs or ga depends if their burst is focusing you, in that case, go for GA, otherwise, and if GA is on cd, go for mogs).

Yes, but after you use your ult, then BoTRK does a big damage after tick. 

hmmm, let's suppose you got 5 autos and the active while the ult mark is on(best case scenario), if the enemy has 0 armor, you would deal 17.5% of his max health in damage.This is with NO ARMOR. In a 1000 hp enemy, 175 bonus damage.In a 3k hp enemy, 425. It gets more efficient the more hp the enemy has and the more penetration you have.Since most people get some armor early, you probably won't get 5 autos off and you have almost no armor penetration/reduction, I don't think it is worth rushing it.

sorry to ask, but im confuse... when using Death Mark, is the shadow spawn is 1 shadow or 2 ?? 

1 shadow, if you used your living shadow previously, you have 2 shadows out.

Why no Botrk Its so OP on Zed!!!! :/

Soooo... Hextech Gunblade, huh? I'm going to assume that since Zed has no AP ratios that it's primarily the spell vamp and life steal we're after, considering his spells do so much damage, for extra sustain. Right? Riiiiight?

Riiiight.

What do you think about starting 2 wards + pots?
boots doesn't kinda help too much against non skillshot champions, just survive till lvl 6 and rape afterwards :0

I always start with pots+2 wards and it works.You don't have to just survive at 6 though(at least not on top lane), if the enemy gets boots or less than 5 pots in an item, you automatically win every trade, you also deal more or equal damage(with e maxed).

I personally start with 1 ward + pots(4) + 1 red pot. It helps me duel the enemy midlaner pre 6 and still win.

If it is a strong poke mage I'd rather start pots(11)+1 ward.

If I get countered by an ad mid I start cloth+pots(5)

I don't like zed mid as much as zed top, but red pot is a viable start nevertheless.I also like to start 9 pots instead of eleven, if you use 9 either the enemy will be OOM or you will have 3k gold...

I LOVE ZED IS SUPER GOOD CHAMPION 

I personally like to delay some survivability, I get boots-brutalizer-bloodthirster-black clever-warmogs or frozen mallet-another BT or IE-GA or another BT- sell black clever for last whisper depending on enemy armor.