Torment of the searing blades

Put a -1/-1 counter on each creature then each opponent discards a card for each -1/-1 counter placed on a creature this way. If they can't discard that many cards they lose 4 life for each card they couldn't discard .
Summon{r}{r}{r}{r}:You may cast this card from your graveyard for its summon cost. If you do you then you lose 20 life minus X where X is your devotion to red plus 4 then exile this card.