Flying, hexproof

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Whenever Howl Attacks, you may cast a noncreature spell from your hand without paying its mana cost. If you cast a spell this way, reveal the top X cards of your library where X is that spells mana value. Put one of the revealed cards into your hand, then shuffle.