Tormented Shade of Salaxum

Dreadful (This creature can only be blocked by creatures with total power greater than or equal to this creature's toughness.)
{b}: This creature gets +1/+1 until end of turn.
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.)