2017-08-25 : If you reveal your entire library and reveal fewer than X creature cards of the chosen type, you'll put the cards of the chosen type that you did reveal onto the battlefield and shuffle your library.

2017-08-25 : You can't choose multiple creature types, such as “Cat Warrior.” A Cat Warrior is both a Cat and a Warrior. It's affected by anything that affects either type and unaffected by things that affect non-Cat or non-Warrior creatures.

2017-08-25 : You must choose an existing creature type, such as Vampire or Cat. Card types such as “artifact” can't be chosen.