Pestilence Rats {2}{B}
Creature — Rat
Pestilence Rats's power is equal to the number of other Rats on the battlefield. (For example, as long as there are two other Rats on the battlefield, Pestilence Rats's power and toughness are 2/3.)
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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.
Plague Rats 87%
$0.16#25802
"this card's power and toughness are each equal to the number of creatures named this card on the battlefield."
Altar Golem 85%
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Beast of Burden 85%
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Caller of the Hunt 83%
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"this card's power and toughness are each equal to the number of creatures of the chosen type on the battlefield."