Arya Stark, the Silent

First strike, death touch, haste
Whenever this creature is blocking or becomes
target of a spell or ability, create a 5/5 legendary creature token called Nymeria, Pack Leader.
Nymeria, Pack Leader enters the battlefield
blocking and/or target of spell or ability instead
of this creature.
"Valar dohearis. Valar morguhlis."
—Arya Stark, the Silent