Frightful Telltale

Cowardly. (Whenever an opponent casts a spell, tap Frightful Telltale. If one or more spells were cast last turn, Frightful Telltale doesn't untap during your untap step.)
Whenever Frightful Telltale becomes tapped, it becomes the creature type of your choice until it becomes untapped.
Creatures that share a creature type with Frightful Telltale have cowardly.