Outbreak 
Sorcery
$0.18 #29611 0.30 26.3 years
You may discard a Swamp card rather than pay this spell's mana cost.
Choose a creature type. All creatures of that type get -1/-1 until end of turn.
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Cards similar to Outbreak expected a card that isn't here?
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"Creatures of the chosen type your opponents control get -1/-1."
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Massacre78%
$0.38↑#11461↑0.06↓26.6 years
"If an opponent controls a Plains and you control a Swamp, you may cast this spell without paying its mana cost."
+1 more matching line
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$0.27↑#18103↑0.2626.3 years
"You may discard a Forest card rather than pay this spell's mana cost."
Abolish76%
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"You may discard a Plains card rather than pay this spell's mana cost."
Flameshot74%
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"You may discard an Island card and another card rather than pay this spell's mana cost."
Rouse73%
$0.19↑#261960.18↓26.9 years
"If you control a Swamp, you may pay 2 life rather than pay this spell's mana cost."
Mutilate73%
$1.25↑#2397↑0.3624.6 years↓
"All creatures get -1/-1 until end of turn for each Swamp you control."
Snuff Out72%
$6.28↑#710↑0.59↑26.9 years
"If you control a Swamp, you may pay 4 life rather than pay this spell's mana cost."
Planar Despair72%
$0.16↓#294230.12↓25.3 years
"All creatures get -1/-1 until end of turn for each basic land type among lands you control."
Crippling Fear70%
$0.37↑#2025↑0.275.6 years↓
"Choose a creature type. Creatures that aren't of the chosen type get -3/-3 until end of turn."
Drag to the Bottom70%
$0.06↓#21276↑0.07↓4.0 years↓
"Each creature gets -X/-X until end of turn, where X is 1 plus the number of basic land types among lands you control."
Nausea70%
$0.03↓#17556↑0.00↓28.2 years↑
"All creatures get -1/-1 until end of turn."
Shrivel70%
$0.10↓#18243↑0.2416.4 years↓
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Infest70%
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Languish70%
$0.34↑#5680↑0.19↓11.1 years↓
"All creatures get -4/-4 until end of turn."