Great Grey Wolf Sif

Vigilance; persist (When this permanent is put into
a graveyard from the battlefield, if it had no -1/-1 counters on it, return it to the battlefield under its
owner's control with a -1/-1 counter on it.)
Partner with Wolf Knight Artorias.
Whenever Great Grey Wolf Sif and one or more
Knights you control attack, Great Grey Wolf Sif
gets +1/+1 until end of turn.