Vayne and her Guinsoo's Rageblade
I found a "Bug"
If you buy 
and Skill W and have 6 Guinsoo's Rageblade Stacks
Your W Stacks come twice [zombie-brand-facepalm]
In my Opinion that veeery OP
3 Comments
At 6 stacks, gain GUINSOO'S RAGE. UNIQUE – GUINSOO'S RAGE: Every other basic attack will trigger on-hit effects an additional time.
Vayne applies silver bolt stacks as an on-hit effect. So once she's at six stacks of rageblade, every other auto attack will apply two stacks of silver bolts. This effectively means she can put three stacks on a target in two auto attacks, so she gets the bonus damage every other hit.
Theoretically strong, yes. But working as intended, not a bug.
A cancer champion is always a cancer, before guinos before anything it's been 6 fucking years to 7 and vayne dominating any duel without getting reworked.
its fucking unfair because she is a range champion who takes on tanks + asasssins + fighters + adcs + supports + mages without having any issue