Hadrik, the Revived

Painborn (Each 1 life you pay while casting this spell pays for {1}. This creature enters the battlefield with a -1/-1 counter on it for each 1 life paid this way.)
Undying (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.)
What it knows is only hatred towards the living.