Choose one: look at a card in your opponent's hand, or a face-down card in your opponent's build zone, or the top card of your opponent's deck. Play only during your build step.
Keywords
Stealth
Stealth: An isolated, static ability that means, "This unit can't be attacked unless it's tapped or has damage counters on it." An untapped and undamaged unit with Stealth can still be affected by alternative types of damage. (Such as Overkill.) As long as the unit has any number of damage counters on it, it can't use Stealth.