When Sifo-Dyas is discarded, search your deck for any card and put it into your hand. Shuffle your deck.
, Pay 4 Force Replace an Event you have in play with another Event from your supply. Play only when the battle phase starts.
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.