Ossuary Rats 
Creature — Rat
$0.23 #20950 0.29 3.9 years
When this creature enters, it deals X damage to target creature or planeswalker an opponent controls, where X is the number of creature cards in your graveyard.
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Cards similar to Ossuary 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.
Lotleth Giant86%
$0.15↓#12436↑0.47↑8.0 years↑
"When this creature enters, it deals 1 damage to target opponent for each creature card in your graveyard."
Thundering Rebuke84%
$0.09↓#179030.386.1 years↑
"this card deals 4 damage to target creature or planeswalker."
Sear84%
$0.33↑#14555↑0.13↓0.7 years↓
"this card deals 4 damage to target creature or planeswalker."
Chupacabra Echo84%
$0.22↓#13743↑0.192.9 years
"When this creature enters, target creature an opponent controls gets -X/-X until end of turn, where X is the number of permanent cards in your graveyard."
Gnarlroot Pallbearer84%
$0.13↓#239090.313.9 years
"When this creature enters, target creature gets +X/+X until end of turn, where X is the number of creature cards in your graveyard."
Cloud of Darkness82%
$0.14↓#170860.251.4 years↓
"When this card enters, target creature an opponent controls gets -X/-X until end of turn, where X is the number of permanent cards in your graveyard."
Iroas's Blessing81%
$0.07↓#230550.05↓6.7 years↑
"When this Aura enters, it deals 4 damage to target creature or planeswalker an opponent controls."
Unleash Shell78%
$0.08↓#249510.06↓3.9 years
"this card deals 5 damage to target creature or planeswalker and 2 damage to that permanent's controller."
Flametongue Kavu78%
$0.08↓#13229↑0.00↓25.7 years↑
"When this creature enters, it deals 4 damage to target creature."
Corrupt Eunuchs78%
$8.52↑#31575↓0.00↓27.5 years↑
"When this creature enters, it deals 2 damage to target creature."
Goblin Commando78%
$0.17↓#27177↓0.07↓27.3 years↑
"When this creature enters, it deals 2 damage to target creature."
Fire Imp78%
$0.05↓#30892↓0.05↓29.5 years↑
"When this creature enters, it deals 2 damage to target creature."
Goretusk Firebeast77%
$0.07↓#29971↓0.05↓24.4 years↑
"When this creature enters, it deals 4 damage to target player or planeswalker."
Rakdos Firewheeler77%
$0.05↓#226120.257.7 years↑
"When this creature enters, it deals 2 damage to target opponent and 2 damage to up to one target creature or planeswalker."
Annie Joins Up76%
$0.64↑#1005↑0.46↑2.5 years↓
"When this card enters, it deals 5 damage to target creature or planeswalker an opponent controls."
Heated Debate76%
$0.14↓#205210.06↓5.5 years↑
"this card deals 4 damage to target creature or planeswalker."
Viashino Pyromancer76%
$0.14↓#16698↑0.05↓8.3 years↑
"When this creature enters, it deals 2 damage to target player or planeswalker."
Cinder Hellion76%
$0.05↓#27438↓0.00↓10.7 years↑
"When this creature enters, it deals 2 damage to target opponent or planeswalker."
Careless Celebrant76%
$0.15↓#214700.05↓6.7 years↑
"When this creature dies, it deals 2 damage to target creature or planeswalker an opponent controls."
Wrath of the Bloodmane75%
$0.11↓#26047↓0.09↓0.0 years↓
"this card deals 4 damage to target creature or planeswalker."