@riot MERCURY boots
i will be honest riot, i prefer the old expensive 35% tenacity
rather than the new cheap 20% tenacity one
just an example, nobody builds those bots because 20% tenacity is almost nothing.
snare which is 3 sec long with merc it will be reduced just to 2.4 sec and in my opinion is pretty useless to buy that.
the only way to make it worthy is that u take the tenacity mastery and
both together with 
my suggestion is: increase the cost but increase the tenacity, or just make more items with tenacity because
is the only item that gives tenacity the other one is only for specific non-rift maps which is 