Celaena, Adarlan's Assassin

Double Strike, Haste, Deathtouch
Celaena enters the battlefield with X +1/+1
Counters on it.
{t}, {b}{r}, Deal X damage to target creature or
player, where X is the number of +1/+1 counters removed from Celaena.
An assassin yet a loyal friend, short-tempered yet compassionate, arrogant yet deeply wounded by
her traumatic past.