This item's capabilities cover multiple areas. It can be used to reveal sections of neutral creep spawn, to set up a gank, or it can be used to chase down an invisible unit that is trying to escape. Be careful who you reveal though, because the +15% AS that is granted to any enemy in the range of the AoE could be devastating to your team, depending on the hero (or heroes!) that receive the buff. All this, while supporting your allies with the aura, Prophet's Insight.
The proposed aura can be found here
, and the icon here