When you finish building this unit, choose Ground, Space, or Character. You may search your deck for 2 cards of the chosen type, show them to your opponent, and put them into your hand. Then shuffle your deck.
If you only have 1 card of the chosen type in your deck, you can still use this card's ability to put it into your hand. If you have 2 or more, you must put 2 cards of the chosen type into your hand; you can't choose to put just 1 because the ability doesn't give you the choice of "up to 2 cards."