Carcass Hauler

Painborn (Each 1 life you pay while casting this
pays for {1}. It enters the battlefield with a -1/-1
counter on it for each 1 life paid this way.)
When Carcass Hauler enters the battlefield, you may return target creature card with converted mana cost X from your graveyard to your hand, where X is the number of -1/-1 counters on Carcass Hauler.