You must do this! Tip for Trolling with an ADC...with math.
Saw another post about this, have to show my support and spread the word after trying it. Every ADC in the game needs to do this! You ready...
Place a single ~+1% Crit Chance T3 Mark Rune in every ADC rune page you run.
Why you ask? Because math...and the math says no other mark will give you more for your money.
Let's look at it shall we...you have a 99% chance each attack of getting nothing, and a 1% chance fo dealing between 200% and 250% damage w/IE. Let's say a typical all on skirmish consists of 5 attacks in early mid game, just for fun. In 5 attacks you have a roughly a 95% chance of getting absolutely nothing...squat...zilch...nada...zero, from said single rune.
Math: 0.99x0.99x0.99x0.99x0.99=0.951%
What this means...is that you DO indeed have a 1 in 20, yes a 5% chance during each early game skirmish (i.e. 5 hit all in) of dealing 200%+ damage one or more times! For those of us who play D20 rpg games, you know that is significant. Not stellar but it happens....a lot.
[Edit] Five extra damage from a damage rune after 5 attacks ain't gonna swing fights, and that is before AR reduction! But 200% damage on a single AA can end a fight in your favor. [/Edit]
That wins fights my friends. Not every fight, not every game even, but it wins fights. What else can you get for that? Five measly damage before one of you is dead? One and some change attack speed? Nothing will give you more bang for your buck.
Now I know what you're thinking? Why if it's so good don't we use more crit chance? Why not a whole page? Well I'll tell you why. A page of full crit marks is just over 8%. That means that 92% of the time you get nothing out of those autos. The majority of your time in lane is spent last hitting minions. And while a single point of damage might not be huge...5+ is...as is 5+ attackspeed, or whatever else you fill your page with. Last hitting is important, and you need your buffs to help...but 1% crit can be game changing if you get one during a fight or even as poke, and given the law of averages, your will more than you think.
Give it a try...and share your lucky crit stories here. The other ADC will hate you, but you will have some good stories to tell of game changing crits if you do.