Ruthless Deathwing

Flying, first strike
When Ruthless Deathwing enters the battlefield, reveal a card from your hand at random. Each creature your opponents control get -X/-X until end of turn, where X is the converted mana cost of the revealed card.
Creatures you opponents control get -1/-1.
"We call it population control. The population calls it the Purge."- Terrokan, Criminal Lawkeeper