Bloodmoon Howler

+1: Add X Mana in any combination of red and/or green to your mana pool, where X is the number of creatures you control
0: Put a 2/2 red and green Werewolf creature token with haste onto the battlefield.
-6: Exile the top 7 cards of your library. You may put any number of creature and/or land cards from among them onto the battlefield.