Here is my suggestion, I think it can be an interesting card to play. In my mind, it also have a great synergy with such cards, as
and other similar, so you can get your value immidiatly.
My take. It can target heroes too, creating a "noggenfogger type of effect". The buff moves between minions or heroes at the end of every turn, and it's possible to end it by silencing a minion while he's holding the buff.