Kashtira Fenrir

If you control no creatures, you may play this on to the battlefield with paying its casting cost.
{0}You may search your library for a creature with Kashtira in its card name, and add it to your hand. This ability can only be activated at sorcery speed.

When your opponent's creature activates an ability, or when this creature attacks, you may target one face-up non-land permanent on your opponent's battlefield and exile it.

Yu-gi-oh - All of this card's abilities can be triggered only once