Obot's Backstabber

Insinuate (You may cast this card face down as a 2/2 creature for {3} that enters the battlefield under target opponent's control. You can still look at this face-down card as long as you own it.)
Whenever Obot's Backstabber attacks you, if it is face-down, you may turn it face-up. If you do, gain control of it and destroy all other creatures attacking you.