Undead Ninja

Ninjutsu {b}{b} ({b}{b}, Return an unblocked attacker
you control to hand: Put this card onto the battlefield
from your hand tapped and attacking.)
Skulk (This creature can't be blocked by creatures
with greater power.)
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its
owner's control with a -1/-1 counter on it.)