name: Massacre
originalText: If an opponent controls a plains and you control a swamp, you may play Massacre without paying its mana cost.
  All creatures get -2/-2 until end of turn.
printings: NEM, PLST, SLD, TD0
text: If an opponent controls a Plains and you control a Swamp, you may cast this spell without paying its mana cost.
  All creatures get -2/-2 until end of turn.
type: Sorcery