Rotting Rats {1}{B}
Creature — Zombie Rat
When this creature enters, each player discards a card.
Unearth {1}{B} ({1}{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.
Fanatic of the Harrowing 99%
$0.20#14198
"When this creature enters, each player discards a card. If you discarded a card this way, draw a card."
Refurbished Familiar 83%
$0.26#7178
"When this creature enters, each opponent discards a card. For each opponent who can't, you draw a card."