Theros, Soul Piercer

Reach, Deathtouch
Creatures Theros, Soul Piercer destroys in combat become exiled and can never be brought out of exile.
When Theros, Soul Piercer destroys a creature place a +X/+X counter where X/X are equal to destroyed creatures power and toughness.
Arrows used by Witherwood Soul Piercers kill not only the body, but the soul as well. Only one can exist at a time, the old is harvested by his or her successor.