To finish building HK-47, put the top 2 cards of your deck into the discard pile.
Stealth
Reveal the top card of your deck HK-47 gets +2 power until end of turn.
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.