Howlpack Piper // Wildsong Howler [Innistrad: Crimson Vow Prerelease Promos]

Whenever this creature enters the battlefield or transforms into Wildsong Howler, look at the top six cards of your library. You may reveal a creature card from among them and put it into your hand. Put the rest on the bottom of your library in a random order. Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)