Pestilence Rats 
Creature — Rat
$0.34 #10639 0.18 31.3 years
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 similar to Pestilence Rats 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.
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"this card's power is equal to the number of Rats you control."
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$2.65↑#3641↑0.40↑13.9 years↓
"this card's power and toughness are each equal to the number of Rats you control."
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$5.30↑#4630↑0.41↑8.4 years↓
"This creature gets +1/+0 for each other Rat you control."
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$0.23↓#22156↓0.36↑4.0 years↓
"this card's power is equal to the number of basic land types among lands you control."
Persistent Marshstalker74%
$0.30↓#5457↑0.00↓2.1 years↓
"This creature gets +1/+0 for each other Rat you control."
Snow Villiers72%
$0.17↓#15502↓0.34↑1.2 years↓
"this card's power is equal to the number of creatures you control."
Soulsurge Elemental72%
$0.28↓#28869↓0.00↓16.4 years↓
"this card's power is equal to the number of creatures you control."
Freedom Fighter Recruit72%
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"this card's power is equal to the number of creatures you control."
Filigree Attendant72%
$0.17↓#8202↑0.59↑5.2 years↓
"this card's power is equal to the number of artifacts you control."
Cephalopod Sentry72%
$0.19↓#126580.06↓3.6 years↓
"this card's power is equal to the number of artifacts you control."
Sylvan Yeti70%
$1.60↑#27814↓0.00↓28.2 years↓
"this card's power is equal to the number of cards in your hand."
Ironroot Warlord70%
$0.24↓#21003↓0.277.2 years↓
"this card's power is equal to the number of creatures you control."
Suki, Kyoshi Warrior70%
$0.23↓#7329↑0.00↓0.8 years↓
"this card's power is equal to the number of creatures you control."
Towering Gibbon70%
$0.33↓#120210.00↓3.8 years↓
"this card's power is equal to the greatest mana value among creatures you control."
Kraven, Proud Predator70%
$0.19↓#18182↓0.36↑1.0 years↓
"this card's power is equal to the greatest mana value among permanents you control."