Miasma Demon 


Creature — Demon
$0.19 #19592 0.29 1.9 years
Flying
When this creature enters, you may discard any number of cards. When you do, up to that many target creatures each get -2/-2 until end of turn.
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Cards similar to Miasma Demon 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.
Ambulatory Edifice84%
$0.08↓#26552↓0.243.6 years↑
"When this creature enters, you may pay 2 life. When you do, target creature gets -1/-1 until end of turn."
Sick and Tired78%
$0.10↓#31039↓0.00↓27.6 years↑
"Two target creatures each get -1/-1 until end of turn."
Ruthless Disposal78%
$0.14↓#25381↓0.00↓10.1 years↑
"Two target creatures each get -13/-13 until end of turn."
Specter of Mortality76%
$0.16↓#227770.13↓3.0 years↑
"When this creature enters, you may exile one or more creature cards from your graveyard. When you do, each other creature gets -X/-X until end of turn, where X is the number of cards exiled this way."
Armix, Filigree Thrasher74%
$0.28↑#6061↑0.235.8 years↑
"Whenever this card attacks, you may discard a card. When you do, target creature defending player controls gets -X/-X until end of turn, where X is the number of artifacts you control plus the number of artifact cards in your graveyard."
Wick's Patrol74%
$0.16↓#15058↑0.362.1 years
"When this creature enters, mill three cards. When you do, target creature an opponent controls gets -X/-X until end of turn, where X is the greatest mana value among cards in your graveyard."