Something vaguely similar to the Dominion's Sweeper.
An item that has an active ability, which when activated, temporarily grants you stealth detection in a circle similar to Oracle. Could last for let's say...10 seconds, with a 60 sec cooldown. Killing a ward could increase the duration by 3 seconds, up to 19 seconds full.
~Victory needs no explanation; defeat allows none.~
I feel like this would be a good idea. Makes vision battles more dynamic than just walking everywhere with Oracles to sweep, has to be used at the right time against stealthed champions. Basically, infuses player interaction and isn't just a broken buff.
"Happiness is nature's way of telling human resources you're overpaid." - Catbert