Massacre 
Sorcery
$0.37 #11702 0.17 26.7 years
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.
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"You may discard a Swamp card rather than pay this spell's mana cost."
+1 more matching line
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"All creatures get -2/-2 until end of turn."
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"All creatures get +X/-X until end of turn."