*Mysterious very early in the duel
*Disconnects from your opponent that give you a draw instead of a win when you had the advantage
*Too much time for your opp to play when they go first (they're waiting for the spy tool to figure out your hand and deck)
*They always hit the important backrow
*They set cosmic/lance despite you having 2 or 3 backrow (they know when you are bluffing)