User blog comment:Willbachbakal/(Item Concept) A New Kind of Crit/@comment-1920550-20150711052318/@comment-1920550-20150713081222

The last thing bruisers (who have potent combination of DPS and tank power) and AD assassins (who by definition already have extreme single target burst) need is a crit item that actually synergizes with their kits by a long shot. Marksmen on the other hand need crit items, because they don't have the same base tankiness of a fighter or the single target burst of an assassin, even AD caster marksmen.

Also one of the main reasons current AD itemization is piss poor is because there is no core item that gives them that raw powerspike like other classes due to the fact that no marksmen fully synergizes with AD items. The closest thing you have to that in the marksmen class is Corki and Ez with the Trinity Force powerspike, because it's stats feeds into their mixed damage, hybrid-scaling spells and they can apply the passive in multiple ways. Lucian used to work that way, until he was reworked. Rabadon bolsters the offensive power of any AP mage in the book. Cinderhulk also works like that for jungle tanks. Righteous Glory gives top/support tanks the engage power they would otherwise not have.

Despite it's issues, live Ghostblade also worked like that before the IE crit chance nerf for a small group of ADC because it's broad spectrum of stats fed heavily into their spell kits and the active synergized hard with their kits and playstyles. On the other hand, your version of Ghostblade has neither the right stats in enough numbers, nor an appealing active for AD casters unlike a Tri-Force/Rabadon/Cinderhulk/R.Glory do for their respective classes.