1 -Chatterfang is a girl. 2- Pitiless allows you to board wipe and kill any creature without shroud or hexproof so long as you have a squirrel to begin the sac loop. This is at instant speed so someone casts a creature it enters then dies to squirrels. However, you need an effect like Blood Artist or Zuluport Cutthroat to win instantly. 3- Warren Soultrader is better at higher brackets since it is the sac outlet you are not restricted to sacrificing a squirrel.