Artoria Pendragon, Saber

Vigilance, First Strike
Servants Constitution - This creature's toughness
is equal to 1 plus X and it can not be exiled.
Excalibur - {p/c}{p/c}{p/c}{p/c}{p/c}, {t}: Deal damage to
target creature equal to twice this creature's
toughness. Excess damage from this ability is
dealt to that creatures controller as
servant damage.
"If you do evil out of a hatred for evil, that rage
and hate will merely birth new conflict."