Gar Na, Artifact Maker

Flying, Trample
When Gar Na, Artifact Maker enters the battlefield, choose one or more;
Put a 0/0 colorless Dragon-Artifact creature
token and put {x} +1/+1 counters on it,
and/or when Gar Na, Artifact Maker enters the battlefield, search your deck for
an artifact card that has {x} in its mana cost and
put it on the battlefield