Removal of Oracles

Oracles needs to be removed OR cost way more gold OR reduce time for duration of item. It is an unfair advantage that a team can literally buy a 300 gold item that removes the ability to play champions properly (shaco, teemo, vayne, etc.) for like 5 minutes. I just played shaco with a teemo in the game and I could not even play my champion without the enemy team seeing me. I'm hoping to get some feedback from the league the community to get opinions about it because I wanted to have fun... not play a game where I can't do anything or play the champ how it's supposed to be played because of 300 gold. Another possibility is having only one member of the team be able to purchase an oracle at a time, so if they die, then you still have an opportunity to be viable. Riot removed true sight from pink wards and most other things from 5's map, and I feel that Aram needs some love on the "true sight" with nerf of oracles.