Bone Devourer 
Creature — Dragon
$0.21 #10346 0.12 1.4 years
Flash
Flying
This creature enters with a number of +1/+1 counters on it equal to the number of creatures that died this turn.
When this creature dies, you draw X cards and you lose X life, where X is the number of +1/+1 counters on it.
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Cards similar to Bone Devourer 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.
Bloodcrazed Paladin92%
$0.33↑#14009↓0.35↑8.9 years↑
"This creature enters with a +1/+1 counter on it for each creature that died this turn."
+1 more matching line
Sautekh Immortal88%
$0.35↑#16208↓0.25↑3.9 years↑
"This creature enters with a +1/+1 counter on it for each creature that died this turn."
+1 more matching line
Khabál Ghoul86%
$131.36↑#27121↓0.27↑32.7 years↑
"At the beginning of each end step, put a +1/+1 counter on this creature for each creature that died this turn."
Marketback Walker85%
$0.37↑#4072↑0.211.6 years
"When this creature dies, draw a card for each +1/+1 counter on it."
+1 more matching line
Novice Occultist85%
$0.24↑#120500.00↓4.9 years↑
"When this creature dies, you draw a card and you lose 1 life."
Gravetiller Wurm84%
$0.25↑#22112↓0.32↑14.6 years↑
"This creature enters with four +1/+1 counters on it if a creature died this turn."
Cackling Slasher84%
$0.10↓#19858↓0.151.9 years
"This creature enters with a +1/+1 counter on it if a creature died this turn."
Somberwald Spider84%
$0.08↓#25350↓0.23↑14.9 years↑
"This creature enters with two +1/+1 counters on it if a creature died this turn."
Festerhide Boar84%
$0.04↓#25507↓0.32↑14.9 years↑
"This creature enters with two +1/+1 counters on it if a creature died this turn."
Liliana's Standard Bearer84%
$0.21#5914↑0.00↓6.2 years↑
"When this creature enters, draw X cards, where X is the number of creatures that died under your control this turn."
+1 more matching line
Grizzly Ghoul83%
$0.21#24104↓0.29↑4.9 years↑
"This creature enters with a +1/+1 counter on it for each creature that died this turn."
Corpse Augur83%
$0.12↓#6019↑0.1210.8 years↑
"When this creature dies, you draw X cards and you lose X life, where X is the number of creature cards in target player's graveyard."
Agent Venom83%
$0.41↑#6229↑0.46↑1.0 years
"Flash"
Gorma, the Gullet82%
$0.74↑#7698↑0.00↓0.4 years↓
"Nontoken creatures you control enter with an additional +1/+1 counter on them for each creature that died under your control this turn."
Asmira, Holy Avenger82%
$1.18↑#24370↓0.33↑29.9 years↑
"At the beginning of each end step, put a +1/+1 counter on this card for each creature put into your graveyard from the battlefield this turn."
Gadrak, the Crown-Scourge82%
$0.32↑#3881↑0.31↑6.2 years↑
"Flying"
Vile Redeemer82%
$0.27↑#106870.1610.6 years↑
"Flash"
Tobias, Doomed Conqueror82%
$0.08↓#25705↓0.184.0 years↑
"Flash"
Vogar, Necropolis Tyrant80%
$13.14↑#13928↓0.44↑3.9 years↑
"When this card dies, draw a card for each +1/+1 counter on it."
+1 more matching line
Promising Duskmage80%
$0.03↓#28079↓0.29↑5.4 years↑
"When this creature dies, if it had a +1/+1 counter on it, draw a card."