Originally Posted by Semiwestern
Well basically what this item does is it gives burst to an adc. And, on Vayne, those 3 crits plus the W proc means that you are probably going to die if we are talking late game. The reset off of 2 kills isnt bad either
You may have known this already, but just for the sake of clarity:
Sword of the Divine: "Champion kills reduce the current
cooldown by 50%"
Granted, it will take you a few seconds to get the second kill, but you are likely to still have at least 5-7 seconds left after your second kill.