[Item Suggestion] Silence
Hello,
what about an item with a single target silence to stop spell spammers in their rotations or catch the stupidly mobile enemy from fleeing? No need to make it last long, maybe 2-3 seconds; 45-60 seconds cooldown. Add some AP / Health / Mana; medium cost around 2-2.5k gold.
Example buildup could be:
Ruby Crystal 
(400), 2x Faery Charm 
(2x125), Fiendish Codex 
(900) + 700 gold recipe = 2250 gold
Stats would be
200 Health
50% Base Mana Regen (maybe more since it's a final item)
50 AP (again maybe a bit more)
10% CDR (kinda hate the fact that like half the AP items have CDR - so maybe instead an Aether Wisp 
with some MS?)
Actice: Single-Target Silence
Too strong? I thought this could be a nice addition for utility supports - stats to survive for a split second longer, and mana for sustain. AP to make it not just a useless item
used to have a silence on his kit and it made him very difficult to respond to when he jumped on someone and started chunking them down then retreated to rinse and repeat until his target was dead (sometimes it would just take one rotation). There wasn't enough counterplay so it was removed. Your item seems like it would bring back that scenario.