Molgir, Plague Bringer

Flash
Flying
When Molgir, Plague Bringer enters the
battlefield, each creature your opponents control
gets -1/-1 until end of turn.
{b}{b}: Each creature your opponents control gets
-1/-1 until end of turn.
{g}{g}: Each other creature you control gets
+X/+X until end of turn, where X is the number
of creatures that died this turn.