Post 8/24/2010 Patch
140 + 228 + 1.3*(103) = 502
With your build, this is how much Mystic Shot is doing. This is of course, not taking into account Armor, so you'll most likely be doing less than this. Your first item for AD Ezreal should always be Brutalizer. It's been proven time and again that the extra damage and armor penetration will do more damage than sheen's bonus will do.

Oh and..
Pre 8/24/2010 Patch
140 + 1.1*(228) + 1.3*(103) = 525
DEWO's math is flawed, you weren't doing any where near the 943 he claimed. He probably thought Trinity Force's effect applied to item bonuses.

OK, just got misslead coz there was no desc about that part.

On the trinity. Well as a AD/AS Ezreal build Trinity would mainly give you:
"Increases your base Attack Damage by 130% for one attack."
and that is 50% boost compared to Sheen. That is imho ALOT.
I can agree that Trinity gives you less than Mallet+Phantom+Sheen. But keep in mind you accualy need to burn another 3k gold to complete those items. And still you will be stuck with only Sheen 80%.

You can accualy get trinity and still go for Phantom next.

At the moment with those stats you are doing 738 Damage per MS.
With Trinity 943 damage.
Ignoring Armor in calculations.

Hard to beat 200 AD diference with any item tbh.

Tried Ezreal many ways. Going physical dps, and not picking up Trinity is quite odd tbh, also... swapping Sheen into LICHBANE???!!! WTF??? with 100AP in the end... not vital at all... sheen buff would give you way better damage with MS than Lichbane. Waste of goldz.
And if you do not go for trinity, but you have all 3 items on you to complete it... and you leave them as they are... isnt it quite... "odd"?

really sucky build man, limit your builds to yourself !

I like this build and i think he meant this is the best way.. which IMO is incorrect but i will accept the statement.. He is going for what looks like a chasing build, getting the sheen first for his mystic shot, smart! i do that too. This build gets a +1 but try some alternatives like infinity and void staff.. thats all man
- HeAt

it is definatelly not the "only way to roll"- just a selfish physical dps build.
I would use trinity instead of lich bane+mallet tbh to be more physical orientated and fill up free slot with some damage item(bloodthirster?) and few things:
1)you cant have ulti lvl2 at level 10.
2)that single point in meditation doesn't make sense- increased neutral buff duration would be more useful imo, especially when carry ezreal can easily jungle.