Smallpox 

Sorcery
Each player loses 1 life, discards a card, sacrifices a creature of their choice, then sacrifices a land of their choice.
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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.
Death Cloud 98%
$3.78#10152
"Each player loses X life, discards X cards, sacrifices X creatures of their choice, then sacrifices X lands of their choice."
Psychic Purge 86%
#28115
"When a spell or ability an opponent controls causes you to discard this card, that player loses 5 life."
Yurlok of Scorch Thrash 83%
$0.43#8272
"A player losing unspent mana causes that player to lose that much life."
Sarevok, Deathbringer 81%
$0.17#13864
"At the beginning of each player's end step, if no permanents left the battlefield this turn, that player loses X life, where X is this card's power."
Gibbering Descent 81%
$2.63#15471
"At the beginning of each player's upkeep, that player loses 1 life and discards a card."