A way to make Sightstone upgrades worth it
With the active strength of 
, 
, and 
there is really no question to pick them over their sightstone brethren of 
, 
, and 
. The only way to make them desirable is to make them have a passive that 1) Isn't strong enough to overpower the active items as they're meant to be stronger 2) Is unique enough where they can cause slight advantages. 3) Fits the theme of the item.
needs to deal with passive supports 
and 
for example. The passive could be something like (After using an ability you and all approaching friendly champions gain 10% increased MS for 3s). This would work like an extremely weak version of , but still fit the peel support mentality.
needs to deal with tanks supports 
and 
for example. The passive could be (You take 5% of the damage that your allies within 1000 units would have taken).
needs to deal with your 
and 
. The passive could be a small 
15% slow upon AA or spell hit for 2s.