Archfiend of Sorrows {5}{B}{B}
Creature — Demon
Flying
When this creature enters, creatures your opponents control get -2/-2 until end of turn.
Unearth {3}{B}{B} ({3}{B}{B}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)
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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.
Massacre Wurm 100%
$1.26#513
"When this creature enters, creatures your opponents control get -2/-2 until end of turn."
Sea Hag // Aquatic Ingress 99%
$0.08#17012
"When this creature enters, creatures your opponents control get -4/-0 until end of turn."
Plague Mare 98%
$0.26#14806
"When this creature enters, creatures your opponents control get -1/-1 until end of turn."
Night Clubber 98%
$0.23#12991
"When this creature enters, creatures your opponents control get -1/-1 until end of turn."
Mouth of the Storm 97%
$0.10#23018
"When this creature enters, creatures your opponents control get -3/-0 until your next turn."