Hermit of the Natterknolls

Creature — Human Werewolf2/3
Whenever an opponent casts a spell during your turn, draw a card.
At the beginning of each upkeep, if no spells were cast last turn, transform this creature.
He hates company . . .
Lone Wolf of the Natterknolls
Creature — Werewolf3/5
Whenever an opponent casts a spell during your turn, draw two cards.
At the beginning of each upkeep, if a player cast two or more spells last turn, transform this creature.
. . . but he'll have you for lunch.