Aprendiza invalidamaga

Text:

Metamorfosis . (Puedes jugar esta carta boca abajo como una criatura 2/2 pagando . Ponla boca arriba en cualquier momento pagando su coste de metamorfosis.)
Cuando la Aprendiza invalidamaga sea puesto boca arriba, contrarresta el hechizo objetivo.

Rulings:

• 10/4/2004 The trigger occurs when you use the Morph ability to turn the card face up, or when an effect turns it face up. It will not trigger on being revealed or on leaving the battlefield.
• 4/15/2013 If a spell with split second is on the stack, you can still respond by turning this creature face up and targeting that spell with the trigger. This is because split second only stops players from casting spells or activating abilities, while turning a creature face up is a special action.