Knock Off 3>
It would be the only real reason to play this card. It earns it's star rating. No weakness, a reistance and only 1 reteat cost makes it efficent. First attack is risky since it's a coin flip effect but 1 colorless energy cost makes it fair and Knock off makes it broken with hand control. Even if it's random, it can screw a deck up.
9/10