Retaliator, Accursed Griffin

Flying, Vigilance, Haste, Trample
Whenever a source deals damage to you, you
may put that many +1/+1 counters on
Retaliator, Accursed Griffin.
As it bore down on those who would seek to slay it,
the wounds of many battles scarred it's flesh. It was
then the men realized they had never stood a chance.