Zed, Master of Shadows

Whenever Zed, Master of Shadows becomes the
target of a spell or ability, you may pay {1}{b}. If
you do, exile him and return him to the
battlefield under your control. He deals damage
equal to his power to target creature. If a creature
dies this way, you get an experience counter.
Zed, Master of shadows gains +X/+0, where X is
the number of experience counters you have.