Blackthorn, the void forged

equipped creature has +x/+x, reach, and
deathtouch
touch the void- if a creature is dealt damage by Blackthorn dies, exile it instead
cursed steel- if a creature wielding Blackthorn dies,
you may exile it instead.if a creature is exiled by Blackthorn,
add its power and toughness to the +x/+x
turns out, souls are better projectiles than arrows.
just don't think too hard about where it gets the energy