Outbreak {3}{B}
Sorcery
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 that do something similar expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Crippling Fear 99%
$2.86#1968
"Choose a creature type. Creatures that aren't of the chosen type get -3/-3 until end of turn."
Pack's Disdain 96%
$0.11#19617
"Choose a creature type. Target creature gets -1/-1 until end of turn for each permanent of the chosen type you control."
Refreshing Rain 90%
$0.22#27430
"If an opponent controls a Swamp and you control a Forest, you may cast this spell without paying its mana cost."
Cho-Arrim Legate 90%
$0.22#27844
"If an opponent controls a Swamp and you control a Plains, you may cast this spell without paying its mana cost."
Harmonized Crescendo 87%
$1.03#3553
"Choose a creature type. Draw a card for each permanent you control of that type."
Distant Melody 87%
$0.40#636
"Choose a creature type. Draw a card for each permanent you control of that type."
Peer Pressure 87%
$1.61#12010
"Choose a creature type. If you control more creatures of that type than each other player, you gain control of all creatures of that type."
Deepwood Legate 86%
$0.16#23900
"If an opponent controls a Forest and you control a Swamp, you may cast this spell without paying its mana cost."
Roar of the Crowd 86%
$0.17#19641
"Choose a creature type. this card deals damage to any target equal to the number of permanents you control of the chosen type."
Massacre 86%
$1.86#11190
"If an opponent controls a Plains and you control a Swamp, you may cast this spell without paying its mana cost."
Kindred Dominance 86%
$3.18#716
"Choose a creature type. Destroy all creatures that aren't of the chosen type."
Kindred Charge 86%
$9.20#5781
"Choose a creature type. For each creature you control of the chosen type, create a token that's a copy of that creature. Those tokens gain haste. Exile them at the beginning of the next end step."