Ulrich, Moon Caller

{x}{r}{g}: You may put a werewolf creature from
your hand onto the battlefield where X is that
creature's converted mana cost. Activate this
ability only at any time you can cast a sorcery.
At the beginning of each upkeep, if no spells
were cast last turn, transform Ulrich, Moon
Caller.
"With the moon, the Krallenhorde will hunt"
—Ulrich, Krallenhorde Alpha