Stlthp, Shadowborn

Skulk (This creature can't be blocked by creatures with greater power.)
Whenever Stlthp, Shadowborn deals damage to a player, look at the top card of that player's library. You may exile that card.
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.)