Rat Colony 
Creature — Rat
$5.31 #4683 0.30 8.5 years
This creature gets +1/+0 for each other Rat you control.
A deck can have any number of cards named Rat Colony.
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Cards similar to Rat Colony 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.
Seven Dwarves92%
$0.56↓#11744↓0.06↓7.0 years↓
"A deck can have up to seven cards named this card."
+1 more matching line
Relentless Rats92%
$4.12↓#11351↓0.2622.4 years↑
"A deck can have any number of cards named this card."
+1 more matching line
Hare Apparent92%
$3.19↓#39080.91↑1.9 years↓
"A deck can have any number of cards named this card."
Persistent Petitioners82%
$0.76↓#10121↓0.65↑7.7 years
"A deck can have any number of cards named this card."
Persistent Marshstalker82%
$0.27↓#56140.07↓2.2 years↓
"This creature gets +1/+0 for each other Rat you control."
Tempest Hawk82%
$0.55↓#11557↓0.351.5 years↓
"A deck can have any number of cards named this card."
Slime Against Humanity81%
$1.86↓#6962↓0.50↑2.7 years↓
"A deck can have any number of cards named this card."
Shadowborn Apostle80%
$1.76↓#10637↓0.40↑13.3 years↑
"A deck can have any number of cards named this card."
Templar Knight80%
$1.68↓#13804↓0.332.3 years↓
"A deck can have any number of cards named this card."
Cid, Timeless Artificer79%
$3.15↓#11307↓0.331.4 years↓
"A deck can have any number of cards named this card."
Dragon's Approach79%
$1.70↓#9390↓0.47↑5.5 years↓
"A deck can have any number of cards named this card."
Sphinx's Approach79%
$0.73↓#17454↓0.300.0 years↓
"A deck can have any number of cards named this card."
Swarm of Rats77%
$0.64↓#9353↓0.07↓28.3 years↑
"this card's power is equal to the number of Rats you control."
Nazgûl77%
$15.38↑#2967↑0.63↑3.3 years↓
"A deck can have up to nine cards named this card."
Pestilence Rats76%
$0.30↓#10929↓0.06↓31.4 years↑
"this card's power is equal to the number of other Rats on the battlefield."
Pack Rat76%
$2.65↓#3744↑0.2714.0 years↑
"this card's power and toughness are each equal to the number of Rats you control."
Charging Hooligan70%
$0.13↓#28130↓0.00↓3.1 years↓
"Whenever this creature attacks, it gets +1/+0 until end of turn for each attacking creature. If a Rat is attacking, this creature gains trample until end of turn."