Tyla, Wildhunt Spymaster

When Tyla, Wildhunt Spymaster enters the battlefield target player reveals their hand. Secretly choose a nonland card from their hand. You may reveal your choice at any time. If you reveal it while that card is on the battlefield you may gain control of it. If you reveal it while it is being cast you may counter that spell and copy it. You may choose new targets for the copy.