Vega's Eternal Prison

When Vega's Eternal Prison enters the battlefield,
exile target creature an opponent controls until
Vega's Eternal Prison leaves the battlefield.
If the exiled creature is legendary, all creatures
your opponents control that share a creature
type with the exiled creature get -X/-X, where X
is the Exiled creature's converted mana cost.
Vega was finally trapped, hopefully for forever.