Blightbringer

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.)
Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
When Blightbringer enters the battlefield, all other creatures get -1/-1 until end of turn for
each -1/-1 counter on Blightbringer.