Glint Hawk | Magic: The Gathering
Formats Glint Hawk is Legal in
Official Oracle Text for Glint Hawk
When Glint Hawk enters the battlefield, sacrifice it unless you return an artifact you control to its owner's hand.
Official Rulings for Glint Hawk
1/1/2011 : You choose which artifact to return to its owner's hand as the triggered ability resolves. If you control no artifacts at that time, you must sacrifice Glint Hawk. Although players can respond to the ability, once it starts to resolve and you choose an artifact you control to return to its owner's hand, it's too late for players to respond.