Venom-Point Ambusher

At the beginning of each end step, you may
pay {b}. If you do, exile Venom-Point Ambusher.
Whenever an opponent attacks you or a
planeswalker you control, if Venom-Point
Ambusher is in exile, you may pay {1}{b}. If you
do, return Venom-Point Ambusher to the
battlefield and destroy target attacking creature.
"Should be an easy job; I know a spot."