Replacing Crit
Crit has often been a top of discussion. Many people would like to see it gone so RNG can overall be removed from the game.
But ADC's are built around it's existence in their end game damage. They get that damage because of the mix of AD/Crit/AS all amplifying each other. There is also the issue of almost every build involving a crit red rune. Relying on a 1% chance for it to work, there have been many videos showing this winning a lane. Junglers take it because another red rune wouldn't help nearly as much as that 1% chance. Even if small. Could even bring in Trynd into this. Getting some Rage then going in hopping for a few crits to win lane.
But the problem still stays. How to keep Marksmen in line without altering other champions too much.
I propose we add a new item effect, Rend. Rend will deal a % of a base attacks damage over 2 seconds. Similar to Draven's old passive. Minus the stacking.
So a Shiv will now give 20% rend instead of 20% crit. Overall this is a damage nerf at the start, as the damage is over a duration. The base part is easy enough to understand, but this can go even further in itemization.
Infinity Edge +80AD +25% Rend
Unique Passive - Basic attack damage to enemies effected by Rend deal 15% increased damage.
This should overall even out most of the damage lost. The % can be adjusted as needed. But we can do more than this.
Flesh Breaker +20AD +20% Rend
Unique Passive: Power - +50AD Unique Passive - Damage dealt from Rend ignores 50% of bonus armor.
Now we have a bit of a different item. If this happens, IE would also trade 50AD for the Power passive. This to discourage building both. As they're both intended to fill the same roll on a ADC's. This item would be stronger on champions who don't necessarily want to sit there and AA the whole time. And could prove useful when facing a team that is strong with Armor(Taric, Rammus).
Could go even further in this and make a new Lifesteal item that gets bonus health from Rend damage.
Problems with that rise I see are mainly champions that have abilities that can use Crit. Yi and Garen mostly. Both can easily be altered. Maybe dealing bonus damage based on half of your current Rend %. Garen's could Rend the target and increase the damage done while spinning to Rended targets. Trynd would become more about getting a full Rage bar, landing an AA for the Rend damage then backing off. Could even get more than that if needed. Maybe his shout could increase the damage effected targets take from his Rend.
Other problem is Shiv. Which IMO doesn't need too much of a change.